Serialization Utilities

Started working on serialization utils (incomplete)
Merge branch 'master' of github.com:LeanderBB/CGE

Conflicts:
	src/cge_core/serial/cge_iserialformat.h
	src/cge_core/serial/cge_serialformatjson.cpp
	src/cge_core/serial/cge_serialformatjson.h
	src/cge_core/serial/cge_serialwriter.h
	src/tests/cge_test_serialize.cpp