Improved exceptions

Many exceptions got an improvement due to changed class or description or details it is providing.
Is not complete, needs to be done in patches in the regions, where it is needed, since some are just
swallowed.

Removed total usage of pure RuntimeExceptions to 0.

src/main/java/appeng/util/iterators/ChainedIterator.java

@@ -22,11 +22,11 @@ package appeng.util.iterators;
 import java.util.Iterator;
 
 
-public class ChainedIterator<T> implements Iterator<T>
+public final class ChainedIterator<T> implements Iterator<T>
 {
+	private final T[] list;
 
-	final T[] list;
-	int offset = 0;
+	private int offset = 0;
 
 	public ChainedIterator( T... list )
 	{
@@ -50,6 +50,6 @@ public class ChainedIterator<T> implements Iterator<T>
 	@Override
 	public void remove()
 	{
-		throw new RuntimeException( "Not implemented." );
+		throw new UnsupportedOperationException();
 	}
 }