FMSLogo Code

Move ltone() from graphics.cpp to mmwind.cpp where it has better coheasion.
ltone() plays a noise, so it belongs near lsound(), not drawing routines.

Add a first pass implementation of tone() that uses wxWidgets.
This enables SOUND and TONE to work on GNU/Linux.
This implementation stutters a bit when given lots of short tones and it's also not safe for integer overflow.

Fix build break on GNU/Linux when precompiled headers aren't used.
gcc got stricter about "#include <file.h>" only being used for system header files.

Fix a comment

Move the initial comment in the code example to an introductory <para>.

Change some SHELL samples to use wordpad.exe instead of audacity.exe.
Wordpad.exe is installed on every Windows machine, which makes the samples runnable by everyone.

Add a few more tests for how RUNPARSE handles minus signs and spaces.

Switch back to using wx-config on GNU/Linux.
wx-config-3.0 not part of wxGTK-devel on Fedora 39.

Refactoring: Use is_caseobject, where appropriate.
This should make the code more readable (if not, the macro shouldn't exist).

Refactoring: remove the "monadic_minus" flag from runparse_node.
Rather than setting a flag and behaving differently on the following iteration, the code now handles the monadic minus in a single iteration. This makes the logic easier to understand (fewer possible states).