Inline Mutex and Thread methods
Implement condition variables
Delete ResourceLoader
Update Crown.h
Update CMakeLists.txt
Implement condition variables
Reworked ResourceManager: collapse ResourceLoader into it and use condition variable to wake up loading thread
Delete Exceptions.h and its last user: Renderer.cpp
Merge branch 'resource-manager' of https://github.com/taylor001/crown into resource-manager

Conflicts:
	src/CMakeLists.txt
	src/Device.cpp
	src/ResourceLoader.cpp
	src/core/settings/IntSetting.h
	src/os/linux/LinuxOS.cpp