5.0.0-RC5

fix(kronolith): constrain unsized icons in AC widget and portal blocks
fix(kronolith): constrain unsized icons in dynamic event editor
Merge pull request #52 from horde/refactor/js-from-pr-50
Fix/meeting attendance (#53)
refactor(kronolith): drop more prototypejs idioms from touched blocks
refactor(kronolith): use plain DOM for free/busy table helpers
fix(kronolith): persist calendar visibility and fix attendee event dialog
Implement bound exception deletion for recurring events
fix(kronolith): harden EAS 16.0 recurring calendar instance sync