[DF-185] StructureSystem::Load method becomes public
Merge branch 'development' of https://github.com/dava/dava.framework into development
[DF-2406] Now scene wont close if user dont select path for saving.
[DF-185] added icons
[DF-2424] Removed unneeded code
Merge branch 'development' of https://github.com/dava/dava.framework into development