stash old results
stubs for smarter pair selection
choice making: IntervalManager: getInterval implemented + tested;
also made test class stub for choice making tests
project refactoring: regrouped headers into logical folders
Hook system improvements:
	got rid of the Hook class family; their role was moved to Hookable
	created test case for ChoiceMaker's pair processing
	IntervalManager: new interval getter that finds an interval matching a pair
	expanded ChoiceMaker's abilities a bit, though it is still very much a WiP
don't use a ChoiceMaker thingy if none is set