- this implements blargg's nes ntsc filters using core options
- an optional height doubling is also added but disabled for performance reasons (might make that optional as a core option)
- since PS2 and PSP have their own blitter branches, these platforms do not have the ntsc filters since i dont have the means to test on those systems.
- compile with HAVE_NTSC=1 to have these options, HAVE_NTSC=0 disabled filter including core options
- HAVE_NTSC=1 is set as default, other than PS2 and PSP as stated above.
- This creates 2 new advance core options to minimize the number of core options shown
-- Advance System Options contains:
--- Overclock
--- RAM power on state
--- no-sprite limit
--- simultaneous opposing direction press
--- zapper crosshairs
-- Advance Sound Options contains:
--- Master volume
--- Sound quality
--- on/off for NES' 5-channel apu
- This also re-arranges the core options when advance options are shown, system options on top,
gfx/palette/geometry options next, input etc.
