- This allows OSystem dependency to be removed in a few places (WIP).
- It more properly belongs in TimerManager, which has other functionality related to std::chrono.
- Historically this was a virtual method in OSystem, since different ports implemented it differently. Now that we use proper C++11 code, it doesn't need to be there anymore.
- Changed from a virtual call to a static call, so it's probably even a little faster.
Previously this was done by SDL_AddTimer, but the new approach is much better:
- it is proper C++ (using std::thread and lambdas)
- It is not tied to the SDL toolkit, which is C-based
Also, re-added logic to reset events ~0.5 seconds after starting ROM emulation; this resets 'hold' events
Stephen Anthony