Plexamp Lite 1.14.1: read-ahead no longer cut off ("Unexpected end of stream")

Two causes, both fixed:
- Plex keeps one file stream per device and cuts the one in progress when another starts, so the read-ahead
  and the player cut each other off. Whole-file fetches (read-ahead, downloads, download-first) now ask for
  the file as a download (?download=1), which Plex leaves out of that rule; the plain address follows for
  servers that refuse downloads.
- Http.abort closed the socket of a response already read to the end, whose connection was back in the pool
  and could be carrying the read-ahead. abort now leaves finished responses alone (test/PoolAbortTest.java).

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

test/stub/android/util/Log.java

@@ -0,0 +1,9 @@
+package android.util;
+
+/** Desktop stand-in for Android's Log, so the network code runs in tests on the computer. */
+public final class Log {
+    private Log() {}
+    public static int i(String tag, String msg) { return 0; }
+    public static int w(String tag, String msg) { return 0; }
+    public static int e(String tag, String msg) { return 0; }
+}