Improved macOS Loopback IP Redirect Support

Building on version 0.5.0, cleans up several aspects of the macOS Loopback IP redirect support.

Loopback HTTP Redirect Support.

Loopback HTTP Redirect support added for macOS.

0.3.0

All PKCE parameters can now be set directly (codeVerifier, codeChallenge and codeChallengeMethod) allowing for methods other than S256 to be supported.