Add a size check for sceKernelReferSemaStatus().
Size check for sceKernelReferEventFlagStatus().
Add sceKernelCancelMutex() tests, update mutexes.
Add some tests for options in mutex/lwmutex.

And also update the lwmutex tests a bit.
Move the semaphore tests into a shared directory.
Add tests for semaphore create options.
Add a test for sceKernelExtendThreadStack().
Merge pull request #74 from unknownbrackets/scheduling

Add test for sceKernelExtendThreadStack(), sceKernelCancelMutex(), and cleanup