This is the first of several large commits intended to resolve a
number of problems and add new capabilities to the java viewer.
Among the most significant changes are a complete re-design of
the options dialog, which has been converted to a callback style
interface.  The look & feel of all dialogs are now similar to
the style of the native viewer now.  Also, the process by which
new viewers are spawned has changed and each viewer is a completely
separate process, allowing for runtime arguments to be handled
statically.

Check CMake version for MinGW RC file handling

Complie error on RHEL7 for missing depency libos.

168b92c broke the handling that assumes display 100 and above are
actually a port number.

They were lost when the mechanism moved from vncconfig in to Xvnc.
Restore the UI by having them reconfigure Xvnc instead.

It was previously controlled by vncconfig which had no restrictions,
so at least include the relevant settings in the default list of
overrides.

Use the platform independent primitives instead.

It now does more validation, and handles unescaped IPv6 addresses
better.

We've changed the service name a couple of times for various
reasons. Make sure the old versions are removed when the new one
is registered.

Add some more dead keys that we've noticed, and clarify the naming
on some existing ones.

We now treat Meta as an independent key, so make sure our test
routines actually verify that it works.

Fixes #270

Old harmless copy/paste from code above left code confusing as it was reusing the filehandle "XSTARTUP" to write out $vncUserDir/config. This new small change uses a more topical filehandle name for the task at hand.

We might be linking our Xregion and libX11 into the same binary,
causing a clash between the symbols. In theory they should be
compatible, but that's not guaranteed. Avoid the issue by adding
a "vnc" prefix to our version.

We've stolen the Xregion code from libX11, so let's keep the same
header naming so that it is easier to keep things in sync.

Debian patches libtool so that the default value of
link_all_deplibs is set to 'no' rather than 'unknown',
causing transitive dependencies in shared objects to
be lost.

Update xenial build to account for distro-specific xorg patches

Fix xserver118.patch so that it actually applies agsinst xorg 1.18