* Simplifies scheduling logic, specifically regarding thread status. It should be much clearer which statuses are valid
for a thread at any given point in the system.
* Removes dead code from thread.cpp.
* Moves the implementation of resetting a ThreadContext to the corresponding core's implementation.
Other changes:
* Fixed comments in arm interfaces.
* Updated comments in thread.cpp
* Removed confusing, useless, functions like MakeReady() and ChangeStatus() from thread.cpp.
* Removed stack_size from Thread. In the CTR kernel, the thread's stack would be allocated before thread creation.
Fixed typo (make protected member public)
Added license header back in. I originally removed this because I mostly rewrote the file, but meh
ARM: Fixed a type error in dyncom interpreter.
ARM: Updated dyncom to use unique_ptr for internal ARM state.
