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/ProxyNodeIterator.java

@@ -27,10 +27,9 @@ import appeng.api.networking.IGridHost;
 import appeng.api.networking.IGridNode;
 
 
-public class ProxyNodeIterator implements Iterator<IGridNode>
+public final class ProxyNodeIterator implements Iterator<IGridNode>
 {
-
-	final Iterator<IGridHost> hosts;
+	private final Iterator<IGridHost> hosts;
 
 	public ProxyNodeIterator( Iterator<IGridHost> hosts )
 	{
@@ -53,6 +52,6 @@ public class ProxyNodeIterator implements Iterator<IGridNode>
 	@Override
 	public void remove()
 	{
-		throw new RuntimeException( "Not implemented." );
+		throw new UnsupportedOperationException();
 	}
 }