[USERLAND][LIBC] Add STD{IN, OUT, ERR}_FILENO define
[KERNEL][CONSOLE] Now logs on serial (not fully supported)
[KERNEL][SCHED] Try to prevent idle thread from running that much
[USERLAND][BIN] Init now support extra options
[USERLAND][BIN] Shell now execute commands properly
[USERLAND][BIN] Add cat binary