Pushed missing files

Started adding Replay Editor using johni0702's excellent ReplayStudio Library
Added fully functional GuiDropdown GUI Element (useable in other projects as well)

src/main/java/eu/crushedpixel/replaymod/studio/StudioImplementation.java

@@ -0,0 +1,39 @@
+package eu.crushedpixel.replaymod.studio;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+import de.johni0702.replaystudio.Studio;
+import de.johni0702.replaystudio.collection.PacketData;
+import de.johni0702.replaystudio.filter.RemoveFilter;
+import de.johni0702.replaystudio.filter.SquashFilter;
+import de.johni0702.replaystudio.io.ReplayOutputStream;
+import de.johni0702.replaystudio.stream.PacketStream;
+import de.johni0702.replaystudio.studio.ReplayStudio;
+
+public class StudioImplementation {
+	
+	public static void trimReplay(InputStream replayFileStream, boolean isTmcpr, int beginning, int ending, File outputFile) throws IOException {
+		ReplayStudio studio = new ReplayStudio();
+        PacketStream stream = studio.createReplayStream(replayFileStream, isTmcpr);
+        stream.addFilter(new SquashFilter(), -1, beginning);
+        stream.addFilter(new RemoveFilter(), ending, -1);
+        
+        outputFile.createNewFile();
+        
+        FileOutputStream fos = new FileOutputStream(outputFile);
+        ReplayOutputStream out = new ReplayOutputStream(studio, fos);
+        PacketData packetData;
+        
+        while((packetData = stream.next()) != null) {
+            out.write(packetData);
+        }
+        for(PacketData data : stream.end()) {
+            out.write(data);
+        }
+        out.close();
+	}
+}