Merge branch 'master' into power-ups
Merge branch 'more-animation-and-timing'
adding some spheres and such

i’m not sure if this is going anywhere worthwhile…
Merge branch 'master' into power-ups
tweaking the event args classes
changed the type of the modifier removed event so it can work without a Modifier object

The Modifier object will have already been destroyed when this event
fires, so it provides the ModifierSpec instead.
implemented modifier removed event
Merge branch 'power-ups'
added narrow paddle modifiers
Merge branch 'power-ups'
Merge branch 'master' into more-animation-and-timing