Allow themes to style more objects (#5197)

* Add Tertiary color and use it for Badges

* Define ripple color for Material Dialog

Although it doesn't do anything, but it should

* Add tertiary colors for Green Apple theme

* Use the correct theme accent in AlertDialog

* Declare a global colorControlHighlight

Fixes some of the ripples listed on #5154.

* Change md_ripple_color to primary ripple color

app/src/main/res/layout/main_activity.xml

@@ -31,7 +31,7 @@
             android:id="@+id/downloaded_only"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:background="@color/green"
+            android:background="?attr/colorTertiary"
             android:visibility="gone"
             tools:visibility="visible">
 
@@ -41,7 +41,7 @@
                 android:layout_gravity="center"
                 android:padding="4dp"
                 android:text="@string/label_downloaded_only"
-                android:textColor="@color/md_white_1000" />
+                android:textColor="?attr/colorOnTertiary" />
 
         </FrameLayout>