fix quads

[ajpal]

There were two issues here- not resetting state and creating additional sprites

1. I added a reset function to the Effect and called it from p5.dance.reset() I think this is a pattern we should follow for all backgrounds that have state to clean up, rather than the current practice of doing that cleanup work at the beginning of the next init()

2. The all dancers do move block used this.p5_.allSprites, but this background creates 12 additional sprites (4 edges, 8 vertices). Then when we tried to change the animation for these sprites, it failed with: Fixed by setting isDancer to true for all dance sprites when we create dancers, then filtering this.p5_.allSprites to only include dancer sprites for all dancers do more

[codecov-io]

Codecov Report

Merging #594 into master will increase coverage by 0.02%. The diff coverage is 26.66%.

@@            Coverage Diff             @@
##           master     #594      +/-   ##
==========================================
+ Coverage   31.36%   31.39%   +0.02%     
==========================================
  Files          28       28              
  Lines        3931     3937       +6     
==========================================
+ Hits         1233     1236       +3     
- Misses       2698     2701       +3

Impacted Files	Coverage Δ
src/Effects.js	34.98% <0%> (-0.08%)	:arrow_down:
src/p5.dance.js	84.1% <80%> (-0.06%)	:arrow_down:

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[joshlory]

Rad, thanks for fixing!