:sparkles: added p2p for objects in the admin plugin

plugins/cia-post-types/includes/p2p-mappings.php

 }
 
 function register_all_one_offs() {
-    register_connections_for('artist', ['artist']);
-    register_connections_for('short', ['technique', 'short']);
+    register_connections_for('object', ['object', 'exhibition']);
+    register_connections_for('artist', ['artist', 'object']);
+    register_connections_for('short', ['technique', 'short', 'object']);
     register_connections_for('guide', ['episode']);
-    register_connections_for('event', ['event']);
+    register_connections_for('event', ['event', 'object']);
+    register_connections_for('episode', ['object']);
 }
 
 function all_connection_types() {
         'guide',
     ];
 
-    // Kick-off by assigning to artist
+    // Kick-off by assigning to object
+    $object = array_shift($connection_stack);
+    register_connections_for($object, $connection_stack);
+
     $artist = array_shift($connection_stack);
     register_connections_for($artist, $connection_stack);