Add the new Alias "Import as Reference" Loader functionality (#90)

* add the new "Import as Reference" Alias functionality
* Add Alias "Import as Reference" new functionality to site env

Author: barbara-darkshot

env/includes/alias/apps.yml

@@ -32,13 +32,13 @@ alias.apps.tk-multi-publish2:
 
 alias.apps.tk-multi-loader2:
   action_mappings:
-    Alias File: [import]
+    Alias File: [import, import_as_reference]
     Wref File: [reference]
-    Igs File: [import]
-    Stp File: [import]
-    Stl File: [import]
-    Jt File: [import]
-    Catpart File: [import]
+    Igs File: [import, import_as_reference]
+    Stp File: [import, import_as_reference]
+    Stl File: [import, import_as_reference]
+    Jt File: [import, import_as_reference]
+    Catpart File: [import, import_as_reference]
     Fbx File: [import]
     Image: [texture_node]
     Photoshop Image: [texture_node]

env/includes/alias/site.yml

@@ -24,14 +24,14 @@ alias.site:
 
     tk-multi-loader2:
       action_mappings:
-        Alias File: [import]
+        Alias File: [import, import_as_reference]
         Wref File: [reference]
-        Igs File: [import]
-        Stp File: [import]
-        Stl File: [import]
-        Jt File: [import]
-        Catpart File: [import]
-        Fbx File: [import]
+        Igs File: [import, import_as_reference]
+        Stp File: [import, import_as_reference]
+        Stl File: [import, import_as_reference]
+        Jt File: [import, import_as_reference]
+        Catpart File: [import, import_as_reference]
+        Fbx File: [import, import_as_reference]
         Image: [texture_node]
         Photoshop Image: [texture_node]
       actions_hook: "{engine}/tk-multi-loader2/basic/scene_actions.py"