display_name translations are deferred translations (use N_ instead of _)
Add new handler 'create_project_tree'
It is registered to 'shapefile:archive:ready' event.
Its purpose is to store and decompress original SHAPEFILE archive in a 'src' folder of project.
It emits event 'shapefile:ready' when it finished.
[handlers create_project_tree] When several .shp files are present in an archive (bad think) take first (alpha order) instead of last
Update path.