TextEditor: Simplify HighlightDefinitionMetaData structure

It's a plain value struct.

Change-Id: I8fc97ed61c47af2c3d9e5cc2bf81e97661204d40
Reviewed-by: David Schulz <david.schulz@digia.com>
Debugger: Fix crash in cdboptionspage.

Change-Id: I467b6c2bfb39f903b01f80dd83a215b926d109df
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>