DataSet upgrade, Firebase input/output, colormap option for patch import/install colors (gray only for now)
- dataset:
  - move image function params to dataset parameters
  - setDefaults(): initialize dataset parameters
  - add setters for dataset parameters
  - simplify/use params:
      toImage, toContext, toDrawing, toPatchColors,
      convolve (clip vs extend edges), slopeAndAspect
- fbui: add input/output UI types for getting/storing Firebase JSON
- sketches: update flockui to use new fbui
- agentsets: use colormap option for importColors, installColors
- util: crossOrigin = "Anonymous"
Merge branch 'master' into gh-pages