Added basic progress label with percentage.
Merge branch 'develop' into feature/add-progress-labels
Updated progress label and constraints.
Added init for specifying style. Included style in displaying labels. Added units label display.
Added percent-symbol label for percent style view. Aligned label to baseline. Refactored constraints.
Fixed bad boolean logic for displaying percent/units labels.
Merge branch 'feature/add-progress-labels' into develop
Removed completely pointless tint color vars for progress/units labels.