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Previously these values were from whatever was on the databus, but new testing
indicates that they are semi-random (ie, random, but with some pattern).

The new code bases the values in part on the md5sum of the ROM (for randomization),
but also pre-generates a set number of values (for a pattern).

Currently only F8SC scheme is implemented.  The remainder will be done once
we test this one.

The new code introduces a generic 'EmulationWarning' exception that can
be thrown for any reason.  The RWP functionality has been ported to use
this, with the main benefit that if we ever have to add new exceptional
cases, we no longer need to modify M6502 class; it will pick up on the
new exceptions and pass them to the EmulationWorker as necessary.

Functionally, the RWP stuff works the same as before, just with a
different implementation behind the scenes.

Added 'DEBUG_BUILD' define to Windows debug builds.

extended trace step count to 10000 (preliminary fix for #393)

- Now video/timer and joystick subsystems are opened and closed in the
proper SDL2 way
- SDL_Quit() is also done at the very end, to clean up any remaining SDL
state
-  Hopefully this fixes the issues with RPi not exiting cleanly.

- Major update is adding 'Chetiry' 60K ROMs info.

It ended up being much easier than I realized.

if globally enabled, disable game specific stereo and phosphor elements
changed global phosphor value label (Default -> Blend)