* Fixed a couple of fixed-size buffers in Windows OSD code.
* Marked MAME as aware of long paths in Windows manifest.
* Made a cleaner, thread-safe API for getting volume names.
* Added compile-time option to disable recompiler W^X mode.
* NuBus image device current directory doesn't need to be pinned.
* Fix save/load states in Emscripten build
* Simplified Emscripten integration points
* Moved standalone JS functions to be static member functions of running_machine
* Improved Emscripten main loop
* Use convenience functions for cleaner code
As an added bonus, this now allows for proper shutdown of the running machine when running in the Emscripten environment - previously, attempts to exit the program were just being ignored.
