AddressParser-related changes and fixes

[Ampflower]

• Requires MixinExtras; it can be JiJ'd if you wish to maintain older Fabric Loader support for older versions of Minecraft.
  • Local sharing is used to avoid using a brittle ThreadLocal.
• Rewrites AddressParser to be immutable and to have utility functions.
  • Able to do port parsing (necessary for some of the fixes needed)
  • Prefix-based parsing (for IPv6; may not be necessary with a clever inject point for the newer UI)
  • Tests via TestNG to ensure that both well-formed and malformed URIs parse as expected.
  • This includes conformance to how the previous parser parsed URIs; the semantic can be changed if needed.
• Strips Via metadata before handing it off to the HostAndPort parser, then reappends it back after via local sharing.
• Strips Via metadata before sending the address to the server.
• Believes to be able to fix #210 (untested; need host).

Prefix Parsing

viafabric.v1.8;localhost is now valid. Additional meta, such as versions, can be separated by +, like for example, viafabric.v1.18+v-2;localhost.

Note, to minimise rewriting more than is necessary, any additional versions specified after the first will be ignored, conforming to the original parser's behavior for both the new and old syntax.

[Ampflower]

Changes to the address parser/format should be explained in the README.md file as well (to make sure users know about it).

I'll write the prefix format down tomorrow, since I'm rather tired. I'm not going to write in the ability to pile up additional options tho, since that was more so mimicking the quirk of the original parser to make sure any existing invalid input in the wild would still work as expected. That can be changed easily tho if that isn't desired; i.e. just don't loop and instead bail after first iteration.

[Kichura]

Decided to test the suffix and it seems to work fine on my end as far as i'm aware.

[Kichura]

This PR has conflicts present, Please attempt to resolve them if you wish to.