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

playlist/PlaylistInfoItemCollector.java

@@ -0,0 +1,32 @@
+package org.schabi.newpipe.extractor.playlist;
+
+import org.schabi.newpipe.extractor.InfoItemCollector;
+import org.schabi.newpipe.extractor.exceptions.ParsingException;
+
+public class PlaylistInfoItemCollector extends InfoItemCollector {
+    public PlaylistInfoItemCollector(int serviceId) {
+        super(serviceId);
+    }
+
+    public PlaylistInfoItem extract(PlaylistInfoItemExtractor extractor) throws ParsingException {
+        final PlaylistInfoItem resultItem = new PlaylistInfoItem();
+
+        resultItem.name = extractor.getPlaylistName();
+        resultItem.serviceId = getServiceId();
+        resultItem.webPageUrl = extractor.getWebPageUrl();
+        try {
+            resultItem.thumbnailUrl = extractor.getThumbnailUrl();
+        } catch (Exception e) {
+            addError(e);
+        }
+        return resultItem;
+    }
+
+    public void commit(PlaylistInfoItemExtractor extractor) throws ParsingException {
+        try {
+            addItem(extract(extractor));
+        } catch (Exception e) {
+            addError(e);
+        }
+    }
+}