This commit allows you to use the Write Cbl Data debug option and new Load Cbl Data debug option to dump a link's data to SRAM
or load it from SRAM and pretend like you got it over the link cable.
This is useful for capturing the link process on gameboy and replay + debug it later in an emulator.
This adds a lot of the debug_mode.h options as an option you can modify at runtime.
I also moved both the text debug screen and the regular debug info screen in there.
And I added an option to start song playback.