Lock shift with a gesture

The circle gesture locks shift. It is also the case for the round-trip
gesture if shift is in a corner.

srcs/juloo.keyboard2/KeyModifier.java

@@ -213,6 +213,7 @@ private static KeyValue apply_fn(KeyValue k)
       case Event: name = apply_fn_event(k.getEvent()); break;
       case Placeholder: name = apply_fn_placeholder(k.getPlaceholder()); break;
       case Editing: name = apply_fn_editing(k.getEditing()); break;
+      case Modifier: name = apply_fn_modifier(k.getModifier()); break;
     }
     return (name == null) ? k : KeyValue.getKeyByName(name);
   }
@@ -268,6 +269,15 @@ private static String apply_fn_editing(KeyValue.Editing p)
     }
   }
 
+  private static String apply_fn_modifier(KeyValue.Modifier m)
+  {
+    switch (m)
+    {
+      case SHIFT: return "capslock";
+      default: return null;
+    }
+  }
+
   private static KeyValue apply_ctrl(KeyValue k)
   {
     if (_modmap != null)