Fix lints that have accumulated over time.
Apparently Android Studio just...stopped using lints. For no reason. I
had to upgrade to the beta version to actually get lints.
Unify the background state layers of the entire app by overriding
colorControlHighlight.
Lots of components still use it, so it's beneficial to make it
consistent with the rest of the app theming.
Use basic scroll indicators when a dialog shows a list.
Mostly for material guidelines. Excluded dialogs and int pref dialog
have not been modified, as I am still working on revamping those.
