systemcmds/manual_control: command line stick input for testing

[dagar]

This is a somewhat silly command line app I hacked together for testing manual_control input through the console. I occasionally use it for testing in jmavsim or gazebo (or sih). Not recommended for real flight (although it does work).

pxh> manual_control

Left: W-A-S-D             Right: I-J-K-L or Arrow keys
|-------------------|     |-------------------|
|                   |     |                   |
|                   |     |                   |
|                   |     |                   |
|         X         |     |         X         |
|                   |     |                   |
|                   |     |                   |
|                   |     |                   |
|-------------------|     |-------------------|
  Yaw:         0%             Roll:     0%
  Throttle:    0%             Pitch:    0%

I will not be offended if someone would like to improve my ascii art.

[MaEtUgR]

Nice! It conflicts with the new manual_control module but definitely something I'd like to take up 🤩