P8SCII control codes and fixes

[jtothebell]

Bug Fixes

• Stub out stat values 120-122 (fix some crashing carts)
• Fix setting map width to 256 (0)
• Fix cartdata return value (credit to @DPS2004)
• music pattern playback with a non-standard length (credit @DPS2004)

Improvements

• Fix local references of pico 8 api methods (possible small performance boost)
• Add support for optional peek and poke arguments
• Add support for most P8SCII control codes (no audio or decoration characters yet)
• Add support for menu item value changes (credit @DPS2004)

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This discussion was created from the release P8SCII control codes and fixes.