Rename *_RIGHT to *_WIDTH and *_BOTTOM to *_HEIGHT in integer expressions for widgets

The terms "width" and "height" are clearer and they match what the values actually represent (window or parent width/height). The YAML changes are generated with the update rule.

OpenRA.Mods.Common/UpdateRules/UpdatePath.cs

@@ -91,6 +91,7 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new MovePreviewFacing(),
 				new RenameOnDeath(),
 				new RemoveParentTopParentLeftSubstitutions(),
+				new RenameWidgetSubstitutions(),
 
 				// Execute these rules last to avoid premature yaml merge crashes.
 				new ReplaceCloakPalette(),