refactor filter UI on participant index to add boolean operation
refactor participant filters
refactor ProgramHistory Filter
fix history filter + refactor participant filter
apply filter to Unmatchable controller
refactor filter operator moved to model
localized filter labels
clean code
Merge branch 'develop' into feature/filter_box

Conflicts:
	app/View/Layouts/default.ctp
Merge branch 'feature/filter_box' into develop