Add Directions for Arcs

Arcs can now move forwards/backwards, left/right
Also removed all extraneous semicolons

Protect against multiple motor commands

Don't call underlying PID control loops if same command is being sent. Also, kill any existing PID control before starting another

Add Buzzer volume controls

Add buzzer sind for selected time, a new buzzer volume block and create a "General" sub-category

Correct PID enable

The PID enabling/disabling was being ignored

Add PRO to pxt.json & readme

Add PRO to pxt.json & readme

Include BitBot PRO

Initial release for BitBot PRO

Include Infrared Remote Control Add-on

v1.5.13

Added infrared remote

Bump to version v1.5.12

Bump to version v1.5.12

Bump version to 1.5.11

Bump version to 1.5.11

Bump to Version 1.5.10

Bump to Version 1.5.10