set metainfo in update (if present)
connection's metainfo can be set

connection's metainfo will be passed along to the routemanage,
connection drawing manager and the decorators when asking for
getConnectionArea

- updataing all the existing decaorators to handle this
- updateing MetaEditorControl to include meta realtion type in
connection metainfo and MetaDecorator uses this information to draw
inheritance type connections from the bottom/top of the item based on if
it's the inheritor or the inherited item