Replaced the progress indicator with a version that allows continuous values instead of 1/2 star values.  Basically moved contents of ProgressIndicator2 to ProgressIndicator and deleted ProgressIndicator2.
Replaced the progress indicator with a version that allows continuous values instead of 1/2 star values.  Basically moved contents of ProgressIndicator2 to ProgressIndicator and deleted ProgressIndicator2.

phetsims/scenery-phet,phetsims/scenery-phet,phetsims/scenery-phet