Create an add_separator function.
Fix crash when deleting links.
Remove the size request and instead set pallete show_arrow to false. This ensures it's always expanded.
Add a separator to pi_config_palette.
Reorder building tool plaette.
Set default tool to move_building again.
Add expedited transfer icon.
Remove third frame around planet drawing widget.
Add ellipsis to Add Extractor Head button to suggest it's a 2-click maneuver.
Update TODO.