feat(templates/lnodetype-wizards): add helper wizard for missing lnClass in templates (#241)

* feat(templates/lnodetype-wizards): get lnClass from NSD file on create

* feat(templates/lnodetype-wizards): add lNodeTypeHelperWizard

* refactor(templates/lnodetype-wizards): introduce autoimport option

* test(templates/lnodetype-wizards): add integration tests for lNodeTypeHelperWizard

* refactor(templates/lnodetype-wizard): minor improvements

* refactor(templates/lnode-type): sort filtered type list

Author: JakobVogelsang