BGM modding: Add a stringifier for PCM formats.
BGM modding: Add a stringifier for PCM formats.

Who needs std::string anyway. And yes, even this constellation gets
inlined completely, without a single copy!

Funded by Splashman.

thpatch/thcrap,thpatch/thcrap,thpatch/thcrap,thpatch/thcrap,thpatch/thcrap