RemoteApp, Virtual Channel, Clipboard, Test and Utils Cleanup

RemoteApp:
* Migrate xfreerdp to RAIL callback interface
* Migrate xfreerdp away from libfreerdp-rail
* Remove libfreerdp-rail library
* Restructure X11 RAIL code

Virtual Channel:
* Remove deprecated eventing system
* Remove deprecated svc_plugin.c util

Clipboard:
* Migrate Android clipboard support to callback interface

Test:
* Remove deprecated cunit utils

Utils:
* Remove old time utils
* Remove old tcp/uds utils
* Remove old RAIL utils