It could be worse

I decided to implement functionality into the FLTK version to bring it to parity with the curses version. It could be better: it could use ctrl-c and ctrl-v; it could have click and drag to move cells. Currently, it is a lot like gvim in how it works: it lives in a different world from normal GUI programs. Also, while doing that, I added two new paste commands. Maybe this is everything I want to do?

sha256sums:
fb80b45b8b5d4f34914531a09193ce778202211b556899f4cf527224829e58c6 DeciCalc.exe
ae7d4c61824155adb99657fab71ac507a940d308ddf9a1f1869569c223743a45 DeciCalc-FLTK.exe

Included libraries (from Cygwin for mingw64-x86_64):

• GMP : 6.3.0-1
• libstdc++ : 12.4.0-1 (the previous release is mistaken)
• ncurses : 6.5-20250412
• FLTK : 1.4.2 (I ended up building it myself)