Add 'blc_command_forward_blc_channels' to make blc_command_loop automatically forward blc_channels without interpreting it

Remove the dynamic test of ANSI terminal in 'blcÃ_program_init'. This was making interferences when different programs are launched at the same time.

blc_init does not set atexit(blc_quit) automatically. You are supposed to pass blc_quit in parameter of blc_quit

Remove a error when the blc_command_loop_end is called and blc_status is quit. It is normal to happen sometime

Separated blc_command in a new blc_loop. Make systemticaly athread to listen to the input ( avoid to block the program)

When quiting a program it does not send 'q'. The following process qhould detect the pipe closure tio quit