Freshened up a bit

As we discussed over email, this pull request includes:
* Work in DFont.java and DrawingHelper.java to simplify the code
* Tweaks to the "1", "2", and "7" numbers in DFont.java

It also includes:
* Updates gradle to the latest version (not sure what 'errorprone' is but removing it allowed the project to compile)
* Resource attributes for DigitalClockView for TextSize, TextThickness, and MorphingDuration