Compilation fails in Visual Studio less than 2019 due to missing include

[James Haley (Nightdive Studios)]

Multiple errors will occur stating "error C2672: 'std::tolower': no matching overloaded function found"; this is only due to the fact that the cctype header is not included at the top of the file so only a template overload which requires a std::locale instance as a second argument is visible to the compiler.

[Z Guan]

Thanks for telling me this! Fixed in the latest version.