Rewrite the Tufty2040 main menu somewhat #668
Merged
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Primarily motivated to get almost everything out of globals and fix issue #631. This is a stripped-down version of the gist there without the memory debugging and reboot-into-direct-boot mode.
Mostly move things to functions. Clean up some dead code and comments. I think the biggest win is not actually the PicoGraphics framebuffer, which is well-behaved, but random temporary floats that were leaking previously.
Also type-annotated and lints clean.
Fixes #631. (As much as I think is possible.)