Added two new projects: robot and kernel

Separated "hal_bio_ax12" into two different modules. "kernel_bio_ax12",
who will retain all the commands to issue to an AX-12 actuator, and
"hal_bio_com", who will be in charge of low-level communication with AX
modules.
Added AX-S1 command API.
Added "kernel_menu", used by project "robot" to allow storage of
multiple programs.