stated on async implementation for content manager.
Merge branch 'master' into asyncContentManager
working on work-list etc.
Merge branch 'master' into asyncContentManager

Conflicts:
	GE_Projekt_2/src/core/Core/ContentHandler/ResourceManager.hpp
working on content queue
uppdated comments
merged with master.
work on async loading. early testing is promising.

Conflicts:
	GE_Projekt_2/src/core/Core/ContentHandler/Resource.hpp
	GE_Projekt_2/src/core/Core/ContentHandler/ResourceManager.hpp
Further work on unloading and loading async.
Pushing load/unload call when unloaded/loaded during operation currently working.

!Need work on error guarding and consistency.
Merge branch 'master' into asyncContentManager
started working on new function structures
Work on callback functionality.
Working on unload functionality.
more work on callbacks
Finishing work on async and callbacks.
Tests implemented. Appears fully functional.
Merge branch 'master' into asyncContentManager_retry