Add depth map export (closes #371)

src/main/java/com/replaymod/render/rendering/FrameConsumer.java

@@ -1,9 +1,10 @@
 package com.replaymod.render.rendering;
 
 import java.io.Closeable;
+import java.util.Map;
 
 public interface FrameConsumer<P extends Frame> extends Closeable {
 
-    void consume(P frame);
+    void consume(Map<Channel, P> channels);
 
 }