Delete HADC.m, replace w/ RewardDelay.m

Signed-off-by: Andrew McKinney <mckinney@neuro.duke.edu>
Create plotRewardDelay and assoc consts

Signed-off-by: Andrew McKinney <mckinney@neuro.duke.edu>
Create and format plotRewardDelay

Signed-off-by: Andrew McKinney <mckinney@neuro.duke.edu>
Misc plotting clarity changes

Signed-off-by: Andrew McKinney <mckinney@neuro.duke.edu>