* Display property from linked object, colored green,
* Change DlgPropertyLink to support external linking and sub-object
selection
* Improve large selection performance by using a timer
* Improve TAB key behavior in property editor
* Add context menu to show hidden properties, change property status,
set expression on any and property, and add/remove dynamic properties
* Optimize expression completer model construction, as the original
implementation gets prohibitively slow for moderate number of objects.
The size of the "..." button calculated by QMacStyle was not correct,
causing other widgets in the layout to be clipped.
Also, set the size of all "..." buttons the same way.
- New editor for MapMode with button to open attacher dialog
- Hide attachment properties when they are not applicable
- Disable super placement ui in attacher dialog when object is not attached
- Always select used mode in mode list
