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/client/texture/FlippableIcon.java

@@ -31,9 +31,8 @@ public class FlippableIcon implements IIcon
 
 	public FlippableIcon( IIcon o )
 	{
-
 		if( o == null )
-			throw new RuntimeException( "Cannot create a wrapper icon with a null icon." );
+			throw new IllegalArgumentException( "Cannot create a wrapper icon with a null icon." );
 
 		this.original = o;
 		this.flip_u = false;