[DF-512] Fixed wrong iterator routine. Added unit tests for hashmap iterator.
[DF-612] Added save/load methods
[DF-612] Fixed lightmap save/load
[DF-576] Added serialization methods
[DF-576] Fixed serialization methods
[DF-514] Small bug fixes
Merge branch 'development' of https://github.com/dava/dava.framework into development