ba91ff1: nwztools: add a new plattools directory with code to run on the device
This is code is intended to development into a library of code for the NWZ that will be useful to write the "bootloader" on those device. At the same time, it comes with test programs that are easy to run in firmware upgrade mode and also provide a great test bench for the library. At the moment, two test programs are available:
- test_display: simply prints two messages using /usr/bin/lcdmsg
- test_keys: displays input key event
The exec_file allows to embed a script/executable and run it on target. It takes of unpacking, remounting contents rw and redirect output to exec.txt at the root of the drive. More generally, rework how the makefile works.