Use Karl Seguin's http.zig as HTTP server backend:
https://github.com/karlseguin/http.zig
Update loggers to use new `jetzig.loggers.LogQueue` to offload logging
to a background thread.
Numerous other optimizations to remove unneeded allocs.
Performance jump on a simple request from approx. 2k requests/second to
approx. 40k requests/second (Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz).
Color support for Windows
Zmpl partial arg type coercion
