REMOVE: The embedded agent APK in assets, with web link used instead.

FIX: Shortcut is not working as expected on Android R.

Also rename the fields "id" to "nid" and "key" to "id" with comments to better reflect their actual roles.

REMOVE: No more emoji translation for notification title. (may cause …

…trouble in re-applying)

FIX: A rare case in which bot message incorrectly generated additiona…

…l inline reply.

ADD: Guide to eliminate double-alert issue, in decorator Settings.

UPDATE: Migrate to new meta-data "settings.activity" and remove launc…

…her entrance.

UPDATE: Avoid using extra channels if removed by WeChat in Insider mode.

UPDATE: Use broadcast to notify the detailed preferences change inste…

…ad of reloading with MODE_MULTI_PROCESS.

MODE_MULTI_PROCESS seems not working on Android Q.

UPDATE: Minor tweaks.

UPDATE: Only tweak ongoing call notification on Android O+, due to la…

…ck of proper experience on older version of Android.