Organize the connections in folders.

Filter connections in quick connect.
Need more custom CSS to handle long connection list.
See also #403

terminus-ssh/src/components/editConnectionModal.component.pug

@@ -9,6 +9,7 @@
                     label Name
                     input.form-control(
                         type='text', 
+                        autofocus, 
                         [(ngModel)]='connection.name', 
                     )