ui: fqtn is now section 0 and short id 11 (they have been swapped)

this provide strong identifier on section 0
config/ui: added idQualifier to Task and TaskGroup
config: Task now supports "local" as default mean
config/ui: restored original columns number between fqtn and short id
libqtssu/modelview: introducing SharedUiItemsModel base class
config/ui: fixed some task attributes names
ui: task and taskgroup have now exactly the same ui sections

This make it far easier to display them within a unified groups-tasks
tree.