Merge remote-tracking branch 'origin/dev' into dev
 #68 first part of the theme tree implementation
 #68 theme tree implementation
 #68 theme tree and first version of the attribute table added
 #68 first toolbar actions of the attribute table added and the selection of the mapping component and the attribute table is synchronised
#68 features of ShapeFileFeatureServices should be shown completely in the attribute table.
Merge branch 'feature/68-theme-tree' into dev