Kvarn utils

This is a collection of HTTP utilities used in the Kvarn web server.

Some miscellaneous Rust utilities are also housed here.

See doc.kvarn.org for the most up-to-date docs.

lib.rs:

Utility functions for web application development.

This includes

• commonly used chars,
• a build_bytes macro to create a Bytes from bytes slices with one allocation,
• WriteableBytes to optimize performance when creating a new Bytes of unknown length,
• hardcoded_error_body to get a hard-coded error response.
• CleanDebug and it's trait AsCleanDebug to get a Debug implementation wired to the item's Display implementation.