Ensure the selection is cleared when there is no motor.
Simplify the RocketComponentVisitor by removing the generic interfaces.
Added functionality to the RocketComponentVisitor by providing a
templated return value.

Modified the Configuration tab UI to disable recovery & staging tabs
when they are not appropriate and adding some help text to the motor
table when there are no motor mounts defined.
Merge pull request #171 from kruland2607/master

Configuration help and simplifications.