[DF-2857] Fixes for LodEditor and RemoveEmptyNodes
[DF-2857] RemoveEmptyNodes related fix
Merge remote-tracking branch 'remotes/origin/temp_lodsystem2' into framework_0_5_5

Conflicts:
	Projects/MacOSFramework/Framework.xcodeproj/project.pbxproj
[DF-2857] Fix for switch-non-lod entities converter
Merge branch 'framework_0_5_5' of https://github.com/dava/dava.framework into framework_0_5_5

Conflicts:
	Sources/Internal/Scene3D/Converters/SwitchToRenerObjectConverter.cpp
Merge branch 'framework_0_5_5' of https://github.com/dava/dava.framework into framework_0_5_5