main commit

Post-processing infrastructure
* remove interfaces with one implementation
* fix download resources with unknow length
* marquee style for ProgressDrawable
* "view details" option in mission context menu
* notification for finished downloads
* postprocessing infrastructure: sub-missions, circular file, layers for layers of abstractions for Java IO streams
* Mp4 muxing (only DASH brand)
* WebM muxing
* Captions downloading
* alert dialog for overwrite existing downloads finished or not.

Misc changes
* delete SQLiteDownloadDataSource.java
* delete DownloadMissionSQLiteHelper.java
* implement Localization from #114

Misc fixes (this branch)
* restore old mission listeners variables. Prevents registered listeners get de-referenced on low-end devices
* DownloadManagerService.checkForRunningMission() now return false if the mission has a error.
* use Intent.FLAG_ACTIVITY_NEW_TASK when launching an activity from gigaget threads (apparently it is required in old versions of android)

More changes
* proper error handling "infrastructure"
* queue instead of multiple downloads
* move serialized pending downloads (.giga files) to app data
* stop downloads when swicthing to mobile network (never works, see 2nd point)
* save the thread count for next downloads
* a lot of incoherences fixed
* delete DownloadManagerTest.java (too many changes to keep this file updated)

app/src/main/java/us/shandian/giga/postprocessing/TestAlgo.java

@@ -0,0 +1,54 @@
+package us.shandian.giga.postprocessing;
+
+import android.util.Log;
+
+import org.schabi.newpipe.extractor.utils.io.SharpStream;
+
+import java.io.IOException;
+import java.util.Random;
+
+import us.shandian.giga.get.DownloadMission;
+
+/**
+ * Algorithm for testing proposes
+ */
+class TestAlgo extends Postprocessing {
+
+    public TestAlgo(DownloadMission mission) {
+        super(mission);
+
+        worksOnSameFile = true;
+        recommendedReserve = 4096 * 1024;// 4 KiB
+    }
+
+    @Override
+    int process(SharpStream out, SharpStream... sources) throws IOException {
+
+        int written = 0;
+        int size = 5 * 1024 * 1024;// 5 MiB
+        byte[] buffer = new byte[8 * 1024];//8 KiB
+        mission.length = size;
+
+        Random rnd = new Random();
+
+        // only write random data
+        sources[0].dispose();
+
+        while (written < size) {
+            rnd.nextBytes(buffer);
+
+            int read = Math.min(buffer.length, size - written);
+            out.write(buffer, 0, read);
+
+            try {
+                Thread.sleep((int) (Math.random() * 10));
+            } catch (InterruptedException e) {
+                return -1;
+            }
+
+            written += read;
+        }
+
+        return Postprocessing.OK_RESULT;
+    }
+}