Plexamp Lite 1.14: Android 4.1 build with ExoPlayer, lyrics, home-screen widget

- One build per Android level, as in Tenda: build/PlexampLite.apk (Android 2.2+, versionCode 1508) and
  build/PlexampLite-api16.apk (Android 4.1+, 1516), from shared src/ plus platform/api8 or platform/api16.
- Android 4.1 build: ExoPlayer 2.18.7 behind a small Engine interface (gapless hand-over to read-ahead and
  downloaded files, a longer buffer, MediaPlayer fallback for tracks it can't decode), a notification and
  lock screen with art and buttons, a resizable widget, Holo, a menu button without a Menu key, metered networks.
  R8 shrinks ExoPlayer and Guava (tools/fetch_exoplayer.sh, tools/r8-rules.pro).
- Both builds: lyrics in Now Playing as in the Mac app (timed lyrics follow and seek), a home-screen widget,
  media play/pause keys, the moon icon drawn without clipPath.
- PlexampLite-noreport on the SD card stops play reports, for tests against a real server.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

res/layout/activity_now_playing.xml

@@ -23,6 +23,7 @@
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:textColor="@color/text" android:textSize="@dimen/text_sub" />
         </LinearLayout>
+        <ImageButton android:id="@+id/np_lyrics_btn" style="@style/IconButton" android:contentDescription="@string/lyrics" />
         <ImageButton android:id="@+id/np_queue" style="@style/IconButton" />
     </LinearLayout>
 
@@ -41,6 +42,11 @@
             android:layout_height="match_parent"
             android:layout_gravity="center"
             android:scaleType="centerCrop" />
+        <com.minamp.LyricsView
+            android:id="@+id/np_lyrics"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:visibility="gone" />
     </FrameLayout>
 
     <LinearLayout