set initial position of target before showing
added output and modularized
print accuracy info in function
print task info
print response times
put response times in seconds instead of ms
print subject and trial number
take operand range for addition event
take operand range in TrialTask
added class for creating block trial tasks
put min operand in ui
take out the enable checkbox
added block selection ui
use new stream-based events
made a separate method for creating events
defer event generation until task is about to start
removed old unused task subclasses
fixed warning from type uncertainty
update score and log event for correct addition response on space bar
color green on correct and reset on new addition task
remove unused event methods
prevent more than one correct response for each problem
make target hit score not depend on distance
removed unused Task method