added cheesyvision_twoballhot for two ball hot auto

this version has two boxes, one sending "LEFT_ON" the other sending "RIGHT_ON"
NOTE: both booleans! NOT floats 1.0 or 0.0
added ENABLE_NT flag for testing w/o network tables

for example, on ubuntu which has no network tables library...
set ENABLE_NT = False and all network tables calls are skipped
so you can still test webcam, image proc, drawing, sizing, etc.