ArcDPS bindings v0.12.0

• Update Effect for ArcDPS effect2, add EffectOld for previous
• Add EffectGUID struct
• Add BreakbarState, BuffStackType, ConditionResult enums
• Add time related helpers to CombatEvent and StateChange, for example CombatEvent::has_time
• Add Strike::dealt_damage
• Add Position::len
• Allow unchecked creation from events, for example BuffFormula::from_event
• Make chrono dependency optional