[Feature Request] Drag-and-drop an entity to another entity's target field

[glhrmfrts]

This will allow a more user-friendly workflow similar to game engines like Unity where you can drag-and-drop an object/component to a script's field to assign a reference to it.

The current name list is nice but it's still laborious when setting up repetitive things like linking a lot of path_corner entities.

If the dragged entity doesn't have a targetname, I think the solution would be to auto-generate one on the fly.

Thank you for an amazing editor!