Added arduino-nano to BOARD_INSUFFICIENT_MEMORY/BOARD_BLACKLIST following suit
of how arduino-uno is marked, as arduino-nano is mostly an Uno in a different
form factor.
Custom targets should be added to BUILDDEPS. Without this patch
`make -j clean all" fails because of weird race condition (trying
to clean while building is kind of contradictory anyways.)
- Remove file related functions from loader.
* All packages must be builtin.
- Remove os.tmpname.
- Interface with TLSF.
- Don't abort() when out of memory.
