Removed the "Prepare Replay" setting (+1 squashed commit)

Squashed commits:
[74a16a9] Created EntityPositionTracker, which parses the whole Replay when initially loading it and remembers every Entity's Position at any timestamp.
The EntityPositionTracker can be disabled using a Replay Setting.

src/main/java/eu/crushedpixel/replaymod/replay/ReplayHandler.java

@@ -11,6 +11,7 @@ import eu.crushedpixel.replaymod.events.ReplayExitEvent;
 import eu.crushedpixel.replaymod.gui.overlay.GuiReplayOverlay;
 import eu.crushedpixel.replaymod.holders.*;
 import eu.crushedpixel.replaymod.interpolation.KeyframeList;
+import eu.crushedpixel.replaymod.preparation.EntityPositionTracker;
 import eu.crushedpixel.replaymod.registry.LightingHandler;
 import eu.crushedpixel.replaymod.registry.PlayerHandler;
 import eu.crushedpixel.replaymod.registry.ReplayGuiRegistry;
@@ -81,6 +82,12 @@ public class ReplayHandler {
      */
     private static Restrictions restrictions;
 
+    /**
+     * The EntityPositionTracker for the current Replay File.
+     */
+    @Getter
+    private static EntityPositionTracker entityPositionTracker;
+
     public static KeyframeSet[] getKeyframeRepository() {
         return keyframeRepository;
     }
@@ -327,6 +334,12 @@ public class ReplayHandler {
     }
 
     public static void startReplay(File file, boolean asyncMode) {
+        entityPositionTracker = new EntityPositionTracker(file);
+        try {
+            entityPositionTracker.load();
+        } catch(IOException ioe) {
+            ioe.printStackTrace();
+        }
 
         ReplayMod.chatMessageHandler.initialize();
         mc.ingameGUI.getChatGUI().clearChatMessages();