Multifunction refactor

[breadoven]

Moves the Multifunction functions from osd.c to the Multifunction module.

Tests OK, all works as before.

[qodo-code-review]

ⓘ You've reached your Qodo monthly free-tier limit. Reviews pause until next month — upgrade your plan to continue now, or link your paid account if you already have one.

[github-actions]

Test firmware build ready — commit 49e2776

Download firmware for PR #11552

234 targets built. Find your board's .hex file by name on that page (e.g. MATEKF405SE.hex). Files are individually downloadable — no GitHub login required.

Development build for testing only. Use Full Chip Erase when flashing.

[Jetrell]

Maybe jumped the gun before it's merged. But thought I'd update it in the modes wiki. So it can be used as a link for the release notes.

[breadoven]

Maybe jumped the gun before it's merged. But thought I'd update it in the modes wiki. So it can be used as a link for the release notes.

Thanks for that. I'll make a few tweaks if need be, e.g. the Warnings redisplay function is pre 9.1 only.

Don't know why I didn't do the functions on a constant cycle before, it's infinitely easier to use, only requiring 2 mode switches to trigger a function or cancel the cycle.