mutex.h et premiers pas sur mutex.c
init sémaphore dans mutex_create
Merge branch 'develop' into feature/mutex

Conflicts:
	src/types.h
Merge branch 'develop' into feature/mutex
Commentaire create() dans .h, implémentation create()
Merge branch 'feature/mutex' of https://github.com/dragibus-4if/dragibus-pi into feature/mutex
free() et acquire(), mais je ne suis pas sûre si acquire() fait le bon truc
Merge branch 'feature/mutex' into feature/pipes

Conflicts:
	src/types.h
Merge branch 'feature/pipes' into test/pipes