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/inv/IMEAdaptorIterator.java

@@ -25,15 +25,15 @@ import appeng.api.storage.data.IAEItemStack;
 import appeng.api.storage.data.IItemList;
 
 
-public class IMEAdaptorIterator implements Iterator<ItemSlot>
+public final class IMEAdaptorIterator implements Iterator<ItemSlot>
 {
+	private final Iterator<IAEItemStack> stack;
+	private final ItemSlot slot = new ItemSlot();
+	private final IMEAdaptor parent;
+	private final int containerSize;
 
-	final Iterator<IAEItemStack> stack;
-	final ItemSlot slot = new ItemSlot();
-	final IMEAdaptor parent;
-	final int containerSize;
-	int offset = 0;
-	boolean hasNext;
+	private int offset = 0;
+	private boolean hasNext;
 
 	public IMEAdaptorIterator( IMEAdaptor parent, IItemList<IAEItemStack> availableItems )
 	{
@@ -73,6 +73,6 @@ public class IMEAdaptorIterator implements Iterator<ItemSlot>
 	@Override
 	public void remove()
 	{
-		throw new RuntimeException( "Not Implemented!" );
+		throw new UnsupportedOperationException();
 	}
 }