RC node in sim only supports 7 channels / Pygame issues

[JMoore5353]

The RC node in simulation only supports 7 channels (due to a pygame limitation). It would be useful to have the same number of RC channels available in simulation as there are on the actual hardware.

[iandareid]

Pygame seems to have multiple issues, in addition to the 7 channel problem, VimFly needs a window to accept input, but the GUI window closes when trying to use in conjunction with ROS timers. The work around is very hacky, and makes me uncomfortable.

It seems like we should stop using pygame entirely, I think we can get the same functionality with rqt, and keep everything in the ROS ecosystem. Thoughts? @JMoore5353 @bsutherland333