Fixes #3520: Correct order for sort by mod and general code cleanup (#3517)

Comparable/Comparator implementation now use fast Java built-ins for
primitive types rather than hand-coded versions. Also DRY some code
and simplify logic.

This maintains the "biggest stack first" notion of "ascending", but
also fixes the inconsistent/accidental reversal of sort by mod (the
mod name should sort the same direction as the item name).

src/main/java/appeng/client/me/ClientDCInternalInv.java

@@ -68,4 +68,4 @@ public class ClientDCInternalInv implements Comparable<ClientDCInternalInv>
 	{
 		return this.id;
 	}
-}
+}