When the label of the button for the boolean widget changes, the size
of the button was also changing. This commit sets the minimum size of
the widget so that it will accommodate both labels.
Remove 48x48 icon; use 256x256 icon only.
Remove icons from the executable.
No need to call gtk_window_set_default_icon_name() anymore.
Add desktop file.
Add install and uninstall Makefile targets.
Update USAGE.md with installation instructions.
Thanks to @szszoke for figuring this one out!
Fixes#2.
Hard-coding a light background for route-label hovering didn't work
well with dark themes which have text in a light colour. Use
@theme_selected_bg_color as suggested by @szszoke.
Fixes#3.
Set the alignment on the socket picture to be center rather than fill
so if there's extra space available the image doesn't get expanded and
look awful.
Fixes#1.
