Filtering, sorting and hiding in Treeview

[DillonJ]

Right now we have a lot of nice capabilities for filtering parameter values, but we can't filter anything in the tree. The ability to filter, sort and hide elements in the treeview would:

• help users customise their view of their data
• control clutter better
• create multiple views of data
• lay foundation for "developer/advanced mode and simple user mode

Some specific funcionalities that I think we should provide:

• Hide unused entity classes (while makeing sure they can be unhidden and that entities of that class can still be created if hidden)
• Flexible sort options
  • Sort by dimensionality and/or entity class name
  • Explicit sort order
• Hide user defined specific entity classes via context menu option

[DillonJ]

Is there any chance we could keep milestone 0.8.1 for this?

[PiispaH]

Sure, I could take a crack at this.