Move all of midiplay into its subdir and add a Makefile for it, add header files...
treee3241b18fae86271c5f3f9e18f819dc9c2ea29f3
drwxr-xr-x - apps
drwxr-xr-x - bootloader
drwxr-xr-x - docs
drwxr-xr-x - firmware
drwxr-xr-x - flash
drwxr-xr-x - fonts
drwxr-xr-x - gdb
drwxr-xr-x - manual
drwxr-xr-x - rbutil
drwxr-xr-x - tools
drwxr-xr-x - uisimulator
drwxr-xr-x - utils
drwxr-xr-x - wps