Splits Engine implementation into multiple classes #178 #196
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Engine is no longer a God-like class. The interface remains the same but it now delegates its logic onto:
EntityManager
SystemManager
FamilyManager
ComponentOperationHandler
The internal classes are package-protected because there's absolutely 0 need to expose them to the user. I could have made them internal private classes of the Engine, but it would have defeated the purpose.
I've added unit tests for each one of them and maintained
EngineTests
as integration tests.