Add GroupCategory to GroupModel
load and save group category
add group category to group view model.
add GroupCategory to ui
Merge branch 'groupCategory'
move DeviceEditorWindow
add empty GroupEditWindow
add converter enum value to description
add GroupEditWindow ui
add handler to doubleclick on groupviewmodel
add descriptions to Groupcategory enum
Merge branch 'GroupEditWindow'
use GroupCategoryConverter
fix bug with right mouse button double click
add editable description
fix bug with desription update