C++ support
This is a strange request. I don't think we need a C++ specific api, but I'd like to add it to the list of language options for a new template. It would generate a main.cpp instead of a main.c, which would then be compiled as C++ rather than C. Maybe could be implemented as custom logic rather than repeating the template in the wasm4 source tree.

I think the only documentation change would be under the "C / C++" Quick Start section, there'd be a "--cpp" option example with a quick explanation.