* Added launch and world files for vrc_task_2 and playground
* Added MATLAB file to create the playground height map

DogWormVRC3
* Added function+command for head pitch control
* Added parameter to chose between rotation modes
* Added command for single rotation
* Added command to reset pose
* Added "status" command to display all the command-line flags:
   Bearing FB, Des. bearing, Terrain type, Rot. mode
* Wrapped JC.send_pos_traj inside send_pos_traj to easily include the head pitch
* Implemented the RotFlag to smoothly transfer between sequences (FWD, BWD, ROTATE)
* Improved bearing response for FWD crawl
* Revamped fast RotateOnSpot sequence
   Use knee0 parameter for slow, tight turn or fast, wide turn
* Started work on RotOnMud sequence, needs more work
* Improved all recovery functions from tipping

seq_generator
* Small changes to FWD crawling gait
* Moved last step of BWD sequence to the beginning of the sequence for smoothness

Signed-off-by: Darpa Tech 3 <darpa3@SMILe03.(none)>