Refactor extractor

- Refactor info classes and extractors
- Reformat and fix indentation
- Organize packages and classes
- Rename variables/methods and fix regex
- Change the capitalization
- Add methods to playlist extractor

stream/AbstractStreamInfo.java

@@ -0,0 +1,41 @@
+package org.schabi.newpipe.extractor.stream;
+
+/*
+ * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
+ * AbstractStreamInfo.java is part of NewPipe.
+ *
+ * NewPipe is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * NewPipe is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import org.schabi.newpipe.extractor.Info;
+
+/**
+ * Common properties between StreamInfo and StreamInfoItem.
+ */
+public abstract class AbstractStreamInfo extends Info {
+    public enum StreamType {
+        NONE,   // placeholder to check if stream type was checked or not
+        VIDEO_STREAM,
+        AUDIO_STREAM,
+        LIVE_STREAM,
+        AUDIO_LIVE_STREAM,
+        FILE
+    }
+
+    public StreamType stream_type;
+    public String uploader = "";
+    public String thumbnail_url = "";
+    public String upload_date = "";
+    public long view_count = -1;
+}