CollectionView; opening correct color editors.

- Changed from a tableView back to a gridView.
  While this may make it harder to read the cell names,
  it may make it easier to “link” the Fixtures to each
  other.

- When the user taps a grid cell, I opening the correct
  color-changing screen based on the Type of Fixture in
  that cell.  This is the main point of the app.  YEAH!
  (Doesn’t do anything yet, but this is a core piece of
  functionality.)