* Rewrite scheduler context switch code
* Fix race in UnmapIpcRestorePermission
* Fix thread exit issue that could leave the scheduler in a invalid state
* Change context switch method to not wait on guest thread, remove spin wait, use SignalAndWait to pass control
* Remove multi-core setting (it is always on now)
* Re-enable assert
* Remove multicore from default config and schema
* Fix race in KTimeManager
* Timing: Optimize Timestamp Aquisition
Currently, we make use of Environment.TickCount in a number of places. This has some downsides, mainly being that the TickCount is a signed 32-bit integer, and has an effective limit of ~25 days before overflowing and wrapping around. Due to the signed-ness of the value, this also caused issues with negative numbers. This resolves these issues by using a 64-bit tick count obtained from Performance Counters (via the Stopwatch class). This has a beneficial side effect of being significantly more accurate than the TickCount.
* Timing: Rename ElapsedTicks to ElapsedMilliseconds and expose TicksPerX
* Timing: Some style changes
* Timing: Align static variable initialization
