More complete coverage of the Symbols For Legacy Computing block,
including characters from Unicode 16.0.
Pixman and the web canvas impl for Canvas have been removed in favor of
z2d for drawing, since it has a nicer API with more powerful methods,
and is in Zig with no specific platform optimizations so should compile
to wasm no problem.
Fixes#2171
ZLS has caused us issues in our Nix shell before and I noted when we
first added it that we probably shouldn't. We now pin to release
versions of Zig so I think its reasonable to expect developers to have
ZLS installed themselves with the proper version or not use it at all.
