Some performance or memory optimizations

Replaced String concat in loops with StringBuilder (performance)
Replaced for with keySet + Map.get() through for with entrySet (perf)
Changed inner classes to static classes, mostly struct like (memory)

src/main/java/appeng/hooks/CompassManager.java

@@ -13,7 +13,7 @@ public class CompassManager
 
 	public static final CompassManager instance = new CompassManager();
 
-	class CompassRequest
+	static class CompassRequest
 	{
 
 		final int hash;