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/InvIterator.java

@@ -25,37 +25,37 @@ import net.minecraft.inventory.IInventory;
 import net.minecraft.item.ItemStack;
 
 
-public class InvIterator implements Iterator<ItemStack>
+public final class InvIterator implements Iterator<ItemStack>
 {
+	private final IInventory inventory;
+	private final int size;
 
-	final IInventory inv;
-	final int size;
+	private int counter = 0;
 
-	int x = 0;
-
-	public InvIterator( IInventory i )
+	public InvIterator( IInventory inventory )
 	{
-		this.inv = i;
-		this.size = this.inv.getSizeInventory();
+		this.inventory = inventory;
+		this.size = this.inventory.getSizeInventory();
 	}
 
 	@Override
 	public boolean hasNext()
 	{
-		return this.x < this.size;
+		return this.counter < this.size;
 	}
 
 	@Override
 	public ItemStack next()
 	{
-		ItemStack result = this.inv.getStackInSlot( this.x );
-		this.x++;
+		ItemStack result = this.inventory.getStackInSlot( this.counter );
+		this.counter++;
+
 		return result;
 	}
 
 	@Override
 	public void remove()
 	{
-		throw new RuntimeException( "no..." );
+		throw new UnsupportedOperationException();
 	}
 }