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/TttmlConverter.java

@@ -0,0 +1,49 @@
+package us.shandian.giga.postprocessing;
+
+import org.schabi.newpipe.extractor.utils.io.SharpStream;
+import org.schabi.newpipe.extractor.utils.SubtitleConverter;
+
+import java.io.IOException;
+
+import us.shandian.giga.get.DownloadMission;
+import us.shandian.giga.postprocessing.io.SharpInputStream;
+/**
+ * @author kapodamy
+ */
+class TttmlConverter extends Postprocessing {
+
+    TttmlConverter(DownloadMission mission) {
+        super(mission);
+        recommendedReserve = 0;// due how XmlPullParser works, the xml is fully loaded on the ram
+        worksOnSameFile = true;
+    }
+
+    @Override
+    int process(SharpStream out, SharpStream... sources) throws IOException {
+        // check if the subtitle is already in srt and copy, this should never happen
+        String format = getArgumentAt(0, null);
+
+        if (format == null || format.equals("ttml")) {
+            SubtitleConverter ttmlDumper = new SubtitleConverter();
+
+            int res = ttmlDumper.dumpTTML(
+                    sources[0],
+                    out,
+                    getArgumentAt(1, "true").equals("true"),
+                    getArgumentAt(2, "true").equals("true")
+            );
+
+            return res == 0 ? OK_RESULT : res;
+        } else if (format.equals("srt")) {
+            byte[] buffer = new byte[8 * 1024];
+            int read;
+            while ((read = sources[0].read(buffer)) > 0) {
+                out.write(buffer, 0, read);
+            }
+            return OK_RESULT;
+        }
+
+        throw new UnsupportedOperationException("Can't convert this subtitle, unimplemented format: " + format);
+    }
+
+}