GNOME Calculator updates

After a long time of low-maintenance (as in me being out of the picture and doing mostly releases and some trivial/not-so-trivial-but-quick fixes here and there) period for GNOME-Calculator, it's time to reveal what's happening behind the scenes. Long-story short, pretty late in the 48 cycle two contributors popped up to breathe some life into GNOME Calculator, so much, that I had a pretty hard…