* add client side integration for custom styles for checkbox.label and checkbox.input

* add server side integration for checkbox element styling

* add server side tests

* add client side test

And remove unused imports.

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

All components are now in immediate mode by default.
V7 compatibility components will use AbstractLegacyComponent that has immediate.
V7 ColorPickerPopup will not have setImmediate, since it extends V8 Window,
which is not in V7 compatibility packages.
Removed OutOfSync and ResynchronizeAfterAsyncRemoval Tests,
since those tested UI in not immediate mode, which is invalid now.
Removed WindowResizeListener, LazyWindowResize, test UIs,
since both used immediate and there were no test run for either.

Change-Id: Ie1c8cfa4c48461db944ff9b13efe8473c5a3298f

Change-Id: I250c60741bc65443b66498a8d0b17541edb77bf1

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

Change-Id: Ic23a84357e1d0d333905ce6b3931c41ee90148f6

Change-Id: I60a58af72d7166869d8bdc8930e16440e02d2ac5

Change-Id: I2e4fb3fb941fda2aa4cbc7154fa9a3f7e8e9ce02

Change-Id: I4a0e580aef1a97ce69238ea0d476599883928d84

Change-Id: I7efb8b10a0d1b19ffdc9eb1d29db1f00b45f17aa

This change is only a brain dead replacement of one specific method. In
some cases, there were some oddities in the surrounding code as well,
but these were left unresolved on purpose.

It should also be noted that DOM.setStyleAttribute just delegates to
element.getStyle().setProperty(), so any null references would have
caused problems already in the existing code.

Change-Id: I340122ac0767af9928076376f76e5bd2c5e19f9f

Change-Id: Ic77338304dc7e58e49f27dcdaf0bab2e00f5bba6

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: I8daf3f377d4d9f2c2f774781e0c68f550d5c86e0

Change in CheckBoxConnector led to wrong enabled behaviour and addition
to top coordinate to prevent scrollbars with VPopupCalendar

Change-Id: I381ab7c8a605535280ae58716181ef4c346997f7

Implementation of suggestions from usage test by an screen reader user

Change-Id: If02512f3d4ee60e3e115023af9d9e600dc11321a

Change-Id: I547f6e6426208d788b92ea8f429d4bb0aa9fdf24

Change-Id: I419ce4581d1a8b84d4236a85a1333d23f3423b2e

Change-Id: I5bc64ed7446ca6f87311bf63f49fb883cfd8b538

Change-Id: I52ca9908763cc7416a2c50971252429cd8c294e8

@Component is not good as the server side does not have to be a Component

Class loaders have problems with referring to static inner classes (e.g.
state classes) when they cannot load the declaring class. To deal with
this the components have been moved to their own packages and state/rpc
classes will be defined in their own Java files.

Added FocusAndBlurServerRpc for sending focus and blur events to any
component.

Components that do not delegate caption handling to parent should not
get a caption

This change removes support for error messages on tabs of a tabsheet or
an accordion. Those should be implemented differently if needed.

This is an intermediate step towards moving error messages from UIDL to
shared state.

status) and enable state handling for components on client side
(depend on parent)

shared state and RPC calls

accordingly