Add initial kernel HLE, includes thread creation and context switching

core: added Kernel::Reschedule() call to check for thread changes, shortened delay time to 100 instructions

svc: added a check to ensure that a service was implemented before attempting to connect to its port

thread: removed unused SwitchContext/Reschedule reason field, added missing arg parameter to SVC CreateThread

thread: moved ThreadStatus/WaitType to header, added support for arg on CreateThread, added correct CPSR reset

svc: added Kernel::Reschedule to svc WaitSynchronization1, updated log messages to include newly created handles

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

README: Update wiki links

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

Fixes issues with building Citra on OSX