GNU Robots Patches to Contribute

[Matthew Henry]

Lockdown has had me spend some time on fun diversions.

I have several patches I'd like to review with the maintainer for contribution.

Added menus to gnurobots (File/Load Map File, File/Quit, Help/About)

Restructured the code to reduce dependencies (e.g. grobot.c used to
bring in the entirety of GTK+, now it only depends on glib.h and
map.h).

Restructured GRobot and Map to emit signals on changes and modified
the GUI code to respond to those signals.  This helps a lot in
isolating the dependencies.

Also I can confirm that GNU Robots does compile and run when checked
out from Git on Fedora 31 (autoconf actually chose Guile 2.2.6, which
is great, though I was surprised since the patch made back in the day
targeted an earlier version of Guile).