release: cut 2.17.0

Reminders are planned and fired in-house instead of waiting for a provider
broadcast that some devices never send (#75), Settings → Calendars becomes the
one visibility model, calendars say what is different about them (#76, #78),
and Settings is sorted into places you'd look for a setting (#69).

app/build.gradle.kts

@@ -28,8 +28,8 @@ android {
         // which builds this version and then creates the matching vX.Y.Z tag +
         // release itself (versionCode is pinned to MAJOR*10000 + MINOR*100 +
         // PATCH from versionName, e.g. 2.7.2 -> 20702). See docs/RELEASING.md.
-        versionCode = 21600
-        versionName = "2.16.0"
+        versionCode = 21700
+        versionName = "2.17.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }