Podlite 1.12: a build for Android 4.1 (Xperia J) with ExoPlayer, speed and skip silences

- One build per Android level, as in Tenda and Plexamp Lite: build/Podlite.apk (Android 2.2+, versionCode 1308) and
  build/Podlite-api16.apk (Android 4.1+, 1316), from shared src/ plus platform/api8 or platform/api16; build.sh now
  runs on the local toolchain (aapt2, dx or R8, signapk.py; the JKS key converted for the run).
- Android 4.1 build: ExoPlayer 2.18.7 behind an Engine interface, with playback speed (player header) and skipping
  silences (Settings), a 3-minute buffer and MediaPlayer as fallback for audio it can't decode; a notification and
  lock screen with the cover and buttons; Holo; a menu button on phones without a Menu key; metered networks for
  "download on Wi-Fi only".
- Both builds: tlskit's Http.abort fix (a finished response's pooled connection is no longer closed under a later
  request); the lock screen's and newer headsets' play/pause keys.

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

AndroidManifest.xml

@@ -1,8 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!-- build.sh makes one APK per Android level from this file: it sets minSdkVersion and targetSdkVersion for each,
+     and versionCode = the one below x 100 + the level (13 -> 1308 for Android 2.2, 1316 for 4.1). -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.miniabs"
-    android:versionCode="12"
-    android:versionName="1.11"
+    android:versionCode="13"
+    android:versionName="1.12"
     android:installLocation="internalOnly">
 
     <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="10" />