[DF-2509] Remove tilemask copy\paste from heightmap editor. Add tilemask copy\paste mode into tile mask editor
[DF-2509] Add tilemask copy\paste ui
[DF-2509] Remove unneeded code
[DF-2509] Fix tilemask copy\paste issue with alexKist brush - invalid brush file format
Merge branch 'dava/development'
[DF-2509] Fix invalid copy\paste start point at the tilemask editor. Fix adding copy\paste undo actions when starting point is not set
Merge branch 'dava/development'

Conflicts:
	Tools/ResourceEditor/Classes/Qt/Scene/System/HeightmapEditorSystem.cpp
	Tools/ResourceEditor/Classes/Qt/Scene/System/TilemaskEditorSystem.cpp
Merge branch 'dava/development'
Merge branch 'dava/development'
Merge branch 'dava/DF-2509_Tilemask_copy_paste'