Improved / Fixed 'add machine' and 'add_machine_state' function.

Now it can be selected if new state is a 'normal' state, which will
trigger the handler auto-creation, or an 'end' where no handler-callback
will exist.
Improved fsm graph visualization.

Existing graph window is closed and updated window is opened.
Updated readme.

Added description for state machine.
Several preparations.

Prepared C++-backend.
Prepared ROS/Robots_in_Concert launch file support.
Added new standard ROS commands in main menu.

- Added actions to start rviz and rqt from main menu.
- ExternalProcessWidget now closes if process has finished. An select-
option(hold on/off) will follow...
Added doc.

Added documentation for ROSCommand.