New xml and mat files for Flashing stim to make compatible with 2P - LG

Added counter to start first trial, tagged lever down, lever up and target on with counter.

Signed-off-by: Lindsey <glickfeld@neuro.duke.edu>
Amended code to only continue if receiving pulses from microscope

Signed-off-by: Lindsey <glickfeld@neuro.duke.edu>