simplify onChange
generalize onChange
refactoring
do not use lazyExtRef
revert addition of lazyExtRef method
simplification
simplification
elim warnings
big refactoring
reorganize definitions
refactoring
add missing Applicative instance
refactoring
don't rely on defaulting
CallbackM is not needed
simplification
runPure function
first version of GLFW backend
better rendering of canvas widgets
initial, very hacky version of EffReff testing