Fix GIF speed and don't use times below 20ms

[dylwhich]

Description

Fixes screen recording GIFs playing back slowly due to using inconsistently supported 10ms frame times. Will occasionally drop frames from the GIF to ensure the timing is reasonably accurate even when the actual frame rate does not fit evenly within 10ms increments.

Test Instructions

Do some screen recordings, upload them to slack or open them in a browser, and see if they work OK and have the right playback speed. Check modes that have different frame rates also.

Ticket Links

Readiness Checklist

• I have run make format to format the changes
• I have compiled the firmware and the changes have no warnings
• I have compiled the emulator and the changes have no warnings
• I have run make cppcheck and checked that cppcheck_result.txt has no warnings for the changes
• I have added doxygen comments to any code used by more than one Swadge mode. This includes /*! \file comments with Design Philosophy, Usage, and Example sections for new headers.
• I have run make docs and checked that doxy_warnings.txt has no warnings for the new code