.gitignore correct netbeans project directories
stm32/desig: include in f4 library

The code is all there and working but simply isn't being built.
[cm3/sync] Add mutex_trylock()

Allows non-blocking use in user code.
[cm3/sync] mutex_lock now calls mutex_trylock repeatedly
Merge remote-tracking branch 'upstream/master'

update my master with upstream