Fix dash parser and more refactor

- Add new itags

stream/StreamType.java

@@ -0,0 +1,10 @@
+package org.schabi.newpipe.extractor.stream;
+
+public enum StreamType {
+    NONE,   // placeholder to check if stream type was checked or not
+    VIDEO_STREAM,
+    AUDIO_STREAM,
+    LIVE_STREAM,
+    AUDIO_LIVE_STREAM,
+    FILE
+}