Add additional class names and style to components and error indicators to distinguish different error levels.

Vaadin 8 implementation of #9816. Cherry picked changes and added compatibility package component changes and tests.

Resolves #3139

Fixes #9606
Fixes #9645
Fixes #9647

* Refactor Html5 DnD client side based on API review

- Moved classes to "correct" packages.
- Removed method DragSourceExtension.clearDataTransferText()
- Remove ButtonDragSource in favor of more generic API

Running formatter:format will format all files in a submodule using an
embedded Eclipse compiler (based on Neon SR1)
according to the regular formatting settings file.

* Overload AbstarctComponent.setDescription() with content mode parameter

Fixes #8185

First round for #8132.

Change-Id: I6939fbc6f7aed0897f50b19f85fb62d0b8368cc7

Change-Id: I0baea991bd80075d63c5d57e3b07f4e9fcb12676

Vaadin 7 compatiblity fields still use setRequired via AbstractField (legacy).
Public setRequiredIndicator is added to AbstractField, AbstractMultiSelect and AbstractSingleSelect.
Internally it is still handled on AbstractComponent & -Connector level.
Changes the declarative syntax, required -> required-indicator-visible.

Fixes vaadin/framework8-issue#419

Change-Id: I940dc66944d27584bd78e5452aee627ee3abd03a

Adds a v7 AbstractFieldConnector for the compatibility package
Remove dependency from core to old AbstractField

Change-Id: I5da665de69cf469adfa946cf18aae1a3e56c3486

Change-Id: I6485dee1ebba12b180a9063ed4b530f7dc63cd77

Change-Id: I4c852b7f9928e190572876690d5bef1234494a5d

Change-Id: I33f1cc33969ff74a95b1b8cc0f2add589be5aae0

Change-Id: I36c426086a2b957f6f738d17470c499a01ddac3b

Long tap causes problems in embedded browsers on iOS (text
selection is performed and/or the OS native context menu is shown).

The support should be re-enabled in the future (see #19406).

Change-Id: I842df12675482c8e529e8bb061958414cc8c0b90

Text and element selection needs to be disabled on touch start for
Android as well. Other touch event handling used by iOS devices is not
used on Android.

Change-Id: I7f17af437ddf4f7b747232fbd19b2cd5c825c0e2

Text or elements should not get selected when there's a context click
listener. Pre-emptively prevent text selection for the whole widget when
that happens.

Change-Id: I3c09d8b2c25d383d6abe079f0fee3809cf5838c7

Change-Id: Id7ec7013bcff446cdf3ce0f2088cb20b0708a56b

Removed Android handling since it already fires a context menu event
when not selecting text. Increased the threshold for iOS move. Prevent
some browser default functionality on TouchEnd after sending context
click event to server.

Change-Id: I9297a5738e593a260b50ba176d483fbdd3293ba3

Touchstart events now fire a contextclick event if there is a context
click listener.

Refactored sendContextClickEvent to accomodate the change.

Change-Id: I9bce5948f89149e9ecb261cfd8ae918470ccec3e

Change-Id: Ifd93251fdc20b93ad276c551796557bb9026766a

Change-Id: I93d5d20925b8ac9b4b108ccc6deec2090e68aa0d

Even though the call to Profiler.enter would be eliminated by the
compiler, it would still include the string concatenation since it can't
prove it wouldn't have any side effects.

Change-Id: Iae3f6d18c409f019d2207d212d00ecb78078bc3e

Change-Id: I667796430eeaa0ddd8142b0c229fe133cd30cd49

Change-Id: I45e6a651daf00f1d6868ad27c042891ef0d34f6a

Change-Id: I345938e5e2196bbc8438b3401879507994b3b050

* Deprecated old methods in Util for backwards compatibility

Change-Id: I9de5e6b930d9f2c0268967dc7b1cf465e6310280

Change-Id: Iceba6be78a49bc1aacf837b9fcd9790749be01c0

Change-Id: Ib36d9c591c5089eeacacc94f68e4fbb064e5418d

State change handling by default clears measured size if the size is set
to undefined; this would cause GridLayout to shrink to zero size because
its child cells have position: absolute. The layout phase recomputes the
size, but in some cases the browser reflows first, affecting the scroll
position of the layout parent. This patch prevents GridLayout from
clearing once-computed sizes during state change.

Change-Id: Id6e066c3ea360083d16d3fcc5c6d7d4bb6cea8b7

Change-Id: Ic77338304dc7e58e49f27dcdaf0bab2e00f5bba6

Change-Id: Id2f56090533fdce756051b32547b3dcaa4f94f93

Renamed Icon to ImageIcon

Change-Id: I608815f17a3651b205fed81b5294385df0d68802

Extracted the abstract client-side Icon class

Change-Id: Ic32e270595a5796d0bbd1dd31f34282b56672aa9

Created the FontIcon class

Change-Id: Iad13871e7bf1807dee2c538c76306d4620191f5e

Renamed AbstractComponentConnector.getIcon to getIconUri

Change-Id: I6953ab79661993b561655d483c1bd013b66407f3

Added the AbstractComponentConnector.getIcon method

Change-Id: I6fb91dc643fb09da3ba53666b1a8a289901702e3

Refactored getIcon

Change-Id: Ibae39e66d0fb8449e20ac5209eb8c18b6ada4387

Made all existing uses of Icon compatible with FontIcons

Change-Id: I8f28ec5254f2e5282a887519d3f44bc1e27aba72

Initial server-side support for font icons - does not include an actual icon set yet (#13152)

Change-Id: Ie6c09b17dd577c726e0efc13567749f6f4d56d8d

Changed server side FontIcon URI generation to match the correct scheme

Change-Id: I3628b930b310b3f285bc58a3f471e31e641d307e

Initial server-side icon font (FontAwesome) with scss - to be considered placeholder for testing (#13152)

Change-Id: I361e62aba0d943a736471824e149d65c7eea9c76

Changed the FontIcon URI scheme

Change-Id: I15c92f6bb3d0aa0a800f3f0bfa80419979453e17

Added FontIcon support to AbstractOrderedLayoutConnector

Change-Id: I3b2b45b22d29622fd888dbe922aa0cc8a718104d

Added FontIcon support to table items

Change-Id: Id22ce94c96a892420aab1e39663688fc9f3bc282

Added FontIcon support to OptionGroup items

Change-Id: Ie08bef688f6802182ef5f8b2bf82cf8b1f9096bb

Switched to openly use FontAwesome (#13152)

Change-Id: I18c3325ce93915b7fd6e338c8c293a89711277bc

VaadinIcons are now FontAwesome (#13152)

Change-Id: I0ab2a80735cbf08b6e33d358e3e8c6a205626fc4

VCaption does not longer set icon to 0x0px if it's a FontIcon (#13152)

Change-Id: Ibcd96e0f79f0adf2e217a8580d17f1cc93705710

Fixed typo in @font-face, removed .otf (#13152)

Change-Id: I698ca32c560e5f198c32a6c44f7884d3030ee610

Make font icons behave more like img (display:inline-block) (#13152)

Change-Id: Ic79186c90f1fc566deae1f4d8d4ba2c21d89a42e

Change-Id: If456a2be242754bcd1e0a8c5be00062a4355af35

Change-Id: I27178a553571a99725ac4a75cae88d55398604ad

Change-Id: I30ee9a968050301d79c5073a62d85390652f76a9

Change-Id: I6b9fb8a664974b68b35050a40ba19bce440b6b3c

Change-Id: I3038b97d9a7c7e144a325ce87aa849309b9b31c4

Change-Id: I4b3c74ede518aa2712038d1451974a93cdecabc2

Change-Id: I5ef3476df3cc0bd41c813fab2cdfa0dc9295d2cb

Change-Id: I164ae83bd6cf98f7a3d7e76d8e717a56e8cb5183

Change-Id: I89311c7e4bdab3a70aa335c203ef57badab7bec8

Change-Id: I80377792ade11946337e2900a7ea84209ae1d060

Change-Id: I059d7ec83f8c4ae43d2ab6e2c80177675c6881d0

Change-Id: I2b097ed67d59260390cd939b2f2d844548b5fced

Change-Id: Ifbb2037290a89fd289407d722962b08f286d887e

Change-Id: I8dbda413f2148f2a28e3867bffe0bc7ea3c8ff93