This was automated using `clang-modernize`.

Most functions already operate on std::strings. This also removes the need to manually null terminate thread names.

Kernel: Made SyncRequest not pure virtual, with a default implementation of error (as this is not required for all kernel objects)

- SVC: Added ExitThread support
- SVC: Added SignalEvent support
- Thread: Added WAITTYPE_EVENT for waiting threads for event signals
- Thread: Added support for blocking on other threads to finish (e.g. Thread::Join)
- Thread: Added debug function for printing current threads ready for execution
- Thread: Removed hack/broken thread ready state code from Kernel::Reschedule
- Mutex: Moved WaitCurrentThread from SVC to Mutex::WaitSynchronization
- Event: Added support for blocking threads on event signalling

Kernel: Added missing algorithm #include for use of std::find on non-Windows platforms.

event: added a hackish ability to set an event as "locked" to its current state, cleaned up some comments