Merge branch 'master' into power-ups
Merge branch 'master' into more-animation-and-timing
define background ring sets in configuration
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
adding some logging to try to diagnose #55, changing the config setup code a bit
backing out the spheres background stuff which isn't ready
fixed #55, which wasn't actually broken

it was a problem with the MessageSpec objects having strange values for
the trails field.
Merge branch 'more-animation-and-timing'
changing the spec construction so it's a bit easier to read

it may just be personal preference, but i like it.
some more verbosification
moved the round configuration builders to separate files