[windows]add xnes.res for windows

[mapper]add mapper 87 support

[mapper]add mapper 79 support

[mapper]add mapper 113 support

[mapper]add mapper15 support

[mapper]add 177 mapper support

[controller]update controller

[examples] SDL_DisableScreenSaver

[controller]remove xnes_controller_joystick_turbo_speed

[mapper]add mapper 241 support

[mapper]add mapper 241 support

[mapper]add some comment for mapper

[controller]add set turbo speed support

[mapper]remove mapper.h header file

[xnes]cleanup the source code, remove xnescore.h

[palette]update palette and add to xnes context

[palette]update palette and add to xnes context

[ppu]Optimize ppu to reduce memory usage

[examples]update examples, modify some joystick

[xnes]modify some keyboard define

[xnes]add rewind support, default rewind 30S

[examples]add save and restore support

[xnes]add state save and restore support

[cpu]fix cpu brk, providing an extra byte of spacing for a break mark

[cpu]fix apu address space

[cpu]fix apu address space

[readme]update readme, and link for 6502 Instruction Set

[cpu]fix cpu brk instruction

[cpu]add comment for cpu debugger callback