Fix crash when adding domain settings with null domain. https://redmine.stoutner.com/issues/906
Update the URL in the copyright header. https://redmine.stoutner.com/issues/796
Bump the minimum API to 23. https://redmine.stoutner.com/issues/793
Change the night access color to light violet. https://redmine.stoutner.com/issues/572
Switch to the new Day/Night theme. https://redmine.stoutner.com/issues/522