Add option for viewing all object names in world #4078

Is your feature request related to a problem? Please describe.

Tiled doesn't have option for viewing all object names when you building map using world, only current selected map objects are displayed.

example map:

Describe the solution you'd like
Add new option for rendering object names when world are loaded:

1. only selected (default)
2. nearest to selected
3. all

Describe alternatives you've considered
Build your map in single file.