Better mod crash logs

core/src/io/anuke/mindustry/game/Content.java

@@ -1,5 +1,6 @@
 package io.anuke.mindustry.game;
 
+import io.anuke.arc.files.*;
 import io.anuke.arc.util.ArcAnnotate.*;
 import io.anuke.mindustry.*;
 import io.anuke.mindustry.mod.Mods.*;
@@ -11,6 +12,8 @@ public abstract class Content implements Comparable<Content>{
     public final short id;
     /** The mod that loaded this piece of content. */
     public @Nullable LoadedMod mod;
+    /** File that this content was loaded from. */
+    public @Nullable FileHandle sourceFile;
 
     public Content(){
         this.id = (short)Vars.content.getBy(getContentType()).size;