Added emulator detection (#651)

* Added emulator detection

* Fixed missing assignments

* Disable interrupts around the count factor test

* Added more comments to emutest

* Changed PJ64 enum values so the versions work as a bitfield

* Updated README

* Fixed comments

* Updated enum values so you can safely AND and OR all emulator version flags together

* Remove redundant gIsConsole, gIsVC, and gCacheEmulated global variables

* Changed console check to be more future proof against Ares

* Use assembly file instead of casting to a function pointer

* Moved round_double_to_float back to its own compilation unit

* Moved the ParallelN64 check before the Ares check for better future-proofing

* Align pj64_get_count_factor_asm with cache lines... not that it actually matters for pj64

* Adjusted some comments

* Made emulator check thread-safe on emulators that emulate PI timings

* Added gIsConsole macro for backwards compatibility

* Added cen64 to INSTANT_INPUT_BLACKLIST

* Updated comment

enhancements/reonucam.patch

@@ -336,7 +336,6 @@ index ad9fdb7d..26e1f000 100644
 @@ -29,6 +29,9 @@
  #include "puppycam2.h"
  #include "debug_box.h"
- #include "vc_check.h"
 +#ifdef REONUCAM
 +#include "camera.h"
 +#endif