nitdbg: Added command to list all commands available

Signed-off-by: Lucas BAJOLET <r4pass@hotmail.com>
nitdbg: Added counter to Breakpoint class

Signed-off-by: Lucas BAJOLET <r4pass@hotmail.com>
nitdbg: Added the command to place a temporary breakpoint

Signed-off-by: Lucas BAJOLET <r4pass@hotmail.com>