[DF-563] hanging objects: ui infrastructure
[DF-653] implement helper
Merge remote-tracking branch 'dava/development' into DF-563_hanging_objects

Conflicts:
	Tools/ResourceEditor/ResourceEditorQtVS2010.vcxproj.filters
[DF-563] implemented completely, tested in windows
[DF-563] fix xcode proj
[DF-563] restore best define