b/2550724 Clean up of https://android-git.corp.google.com/g/#change,46783

No functional change. Just clean up per code review:
Rename TextAppearance.widget_xxx to TextAppearance.XxxWidget
Added android:visibility="gone" for items that won't be visible
Replaced hard coded strings with constants in where clause e.g. "startDay" -> Instances.START_DAY
Removed EventInfo.hashCode() and EventInfo.equal(). Will be comparing .toString in the tests instead
Renamed getAppWidgetModel to buildAppWidgetModel

Change-Id: Id70b891df2323ae0af9500c3cfabc60940366934
5 files changed