The previous code used `androidx.appcompat.widget.Toolbar` in a several
places.
It's better to use `MaterialToolbar` as that plays better with other
Material components.
Update the usage throughout the project.
In addition, implement a lint check that will prevent any future use
from creeping back in.
Fixes#28
Instead of linking to the privacy policy embed it in the app as a string
of HTML.
The string is created with a new `markdown2resource` plugin, which
converts `PRIVACY.md` to HTML and generates a Java class with the HTML
content.
Create `PrivacyPolicyActivity` to display the HTML in a `WebView`, and
link to it from `AboutActivity`.
The existing language list is incomplete, sorted incorrectly and does
not use the correct language names.
Add a small tool that parses the resource directories that contain
string translations, determines the correct language name and sort
order, and updates the correct application resources so language
lists are displayed correctly.