libfatfs now with less mem consumption

The entire file system is no longer cached by default. This saves a lot of (ram) memory but access times might be slower when opening, making, or removing a file/folder. The amount of time it takes to read and write to files is not affected.

If you want to enable the cache, (in the Makefile) add -DFATFS_CACHEALL to KOS_CFLAGS.

Stable

Implements most of FAT16 & FAT32 including long filenames, reading, writing, creating files/folders, deleting files/folders.