Simulator: Add car simulation
Sim: Enable ground follower
Ground Path Follower: Enable for all appropriate targets
Rover: Include manualcontrolcommand

The manualcontrol module was included for the ground path
follower but is not needed.
Ground path follower: small fixes
Merge branch 'rover_pathfollower' into next
Merge branch 'next' of github.com:TauLabs/TauLabs into next