Initial multi cart support

[jtothebell]

Features

• Adds basic multi cart support (Note: no BBS connectivity, you must bring your own carts)
• implement audio stat calls
• implement color bitmask flag at 0x5f5e

Fixes

• Handle emojis correctly in text
• fix tline wrapping bug

QOL improvements

• Sort carts alphabetically
• Scroll through carts by 10 with up/down
• make select/- change image stretch instead of R
• add 4x3 image stretch options

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This discussion was created from the release Initial multi cart support.