Various small cleanups #10

Merged xogium merged 8 commits into LuminaSensum:main from LuminaSensum:jookia/cleanup1 on 23 Mar 2023

2023-03-23	f1aea8e Browse files » main: Unmount filesystem on shutdown Jookia committed on 23 Mar 2023
	82dfcff Browse files » ButtonThread: Remove private functions from include Jookia committed on 23 Mar 2023
	38f6364 Browse files » ButtonThread: Use a more descriptive error message Jookia committed on 23 Mar 2023
	337ffc6 Browse files » src: Don't pass FileSystem to doErase and doUSBMSD ... They don't need the filesystem now, so get rid of this arg. Jookia committed on 23 Mar 2023
	a778760 Browse files » main: Handle mounting and unmounting for erase and MSD ... Having the functions handle the filesystem creates an dependency on the filesystem layer when the functions don't even use it. Instead, have main handle mounting and unmounting the filesystems. Jookia committed on 23 Mar 2023
	71e16f2 Browse files » Filesystem: Refer to mbed::FileSystem not LittleFileSystem2 ... Functions don't need to know about what kind of filesystem we pass it, so just tell them it's a mbed::FileSystem. Jookia committed on 23 Mar 2023
	8e90af4 Browse files » MyUSBMSD: Include Filesystem.h Jookia committed on 23 Mar 2023
	77f30d0 Browse files » ButtonThread: Remvoe unused flag Jookia committed on 23 Mar 2023