Move individual mutex tests into a single dir.

Cleaner this way.
Cleanup mutex tests and check status info.
Add a test for sceKernelReferMutexStatus().
Move the lwmutex tests all into the same dir.
Test LwMutex status every step of the way.
Add tests for sceKernelLwMutexReferStatus*().
Merge pull request #63 from unknownbrackets/scheduling

Tests for Mutex/LwMutex status funcs