[DF-879] and [DF-882] fix.
[DF-918] fix.
DF-772
[DF-772] UIList cell implemenation.
[DF-772] Visual Studio project files update.
[DF-772] Resize of UIList and its cells.
[DF-870] Add ability to remove platforms/screens/aggregators from disk. Add import of the existing platforms/screens/aggregators. Refactor unsaved changes counting. Fix several issues
[DF-870] Fix Win32 project
[DF-870] Small fix, remove unneeded code
[DF-948] Remove "Set xxx for all states" flags
Merge remote-tracking branch 'origin/UIEditor' into development

Conflicts:
	Projects/UnitTests/Classes/GameCore.cpp
	Tools/UIEditor/Classes/Models/HierarchyTreeAggregatorNode.cpp
Merge remote-tracking branch 'DAVA/development' into development
Merge pull request #173 from adebt/development

UI Editor - merge to Development.