Fix DatePicker max date, disabled day color, and arrow visibility

Day validation moved from the PagerAdapter to the DayPickerView,
which is widget that actually handles the touch interaction and
disabled state for individual days.

Fixed disabled states for primary and secondary activated text
colors. Replaced old light/dark color state lists with themed
versions.

Removed conflicting view visibility changes for managing next and
previous arrows in DayPickerView.

Bug: 20630417
Bug: 20641013
Bug: 20641879
Change-Id: Icdaf02a3b57ec162169c31b8a27ebea908552321