Messaging: Implement per conversation channels. Update API level to 28.

* Get rid of in-app settings for notifications, replaced by channels features
* Remove all the notification plumbing and dead code

Test: m, manual

Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Signed-off-by: Joey <joey@lineageos.org>
Signed-off-by: Danny Baumann <dannybaumann@web.de>
Signed-off-by: Arne Coucheron <arco68@gmail.com>
Signed-off-by: Lyubo <lyubodzhamov@gmail.com>
Change-Id: Idb39ca32751d40b3376934775d2119dd6cc7e297

src/com/android/messaging/ui/UIIntents.java

@@ -264,16 +264,6 @@ public abstract class UIIntents {
      */
     public abstract Intent getViewUrlIntent(final String url);
 
-    /**
-     * Get an intent to launch the ringtone picker
-     * @param title the title to show in the ringtone picker
-     * @param existingUri the currently set uri
-     * @param defaultUri the default uri if none is currently set
-     * @param toneType type of ringtone to pick, maybe any of RingtoneManager.TYPE_*
-     */
-    public abstract Intent getRingtonePickerIntent(final String title, final Uri existingUri,
-            final Uri defaultUri, final int toneType);
-
     /**
      * Get an intent to launch the wireless alert viewer.
      */