thread: added correct lowest thread priority, added a thread priority check, and added some comments

- cleaned up Kernel code a bit (moved stuff into namespace, fixed whitespace issues)
- added handle types for all different CTROS handles

apt: changed stubbed handle to be something other than 0xDEADBEEF (used as a magic value in other places) so that I can track how it propagates through the app code

- updated CreateHandle/DeleteHandle to use KernelObject's

- various cleanups

- added ResetType enum

- changed some stubbed SVCs to return unique handle names for debugging purposes

- reorganized some kernel thread functions
- added placeholder __KernelWaitThread_Synchronization function

- added KERNEL_DEFAULT_STACK_SIZE definition (0x4000)

ARM VFP support - integrated from SkyEye