Adds overloads to relationService.AreRelated

Allows to lookup relations based on type and alias of type when doing
"AreReleated()" checks
Removes option to query media with Xpath on mntp

Only content can be queried with Xpath in a reasonable performant manner
as its the only type of data that is cached as xml
Enables listview children in dialog trees

By default trees doesnt show children of listview nodes, this enables
them in dialog trees, otherwise content pickers cannot select childrens
of a listview node
Fixes broken refresh action

Refresh action referenced the tree, not its root node
Fixes treenodes with very long names breaking the tree