Remove "config" Dependency

[LivacoNew]

The config crate is what I previously used for configuration up until this point. The problem is it's really really slow; _{NOTE: Ignore the wrong hostname output, this is due to me also changing the way color placeholders are done in config files.}

So, my solution is simple; remove it. I've written my own way for handling value defaults, as well as my own janky TOML parser.

Some notes for this;

• The code is really messy. I want to spend some time cleaning it up.
• A lot of TOML parsing issues exist;
  • Quoted/Dotted keys are not supported, and will break things if used.
  • Duplicate keys are not checked - Whichever one comes last overrides unlike standard TOML behavior where they are checked and blocked.
  • Literal strings aren't handled right, instead just getting parsed as regular strings.
  • Tons of data types haven't been implemented, because CrabFetch doesn't use them so I didn't see the point.
  • Arrays are only supported with strings and colors, other datatypes break.
  • Probably a lot more problems I'm unaware of.
• A lot of error testing needs to be done, as again, janky.

I'm not sure whether to merge this or not yet, if I do it will be after a bit more testing. If anyone does read my ramblings here and wants to run this PR to test it, please go ahead. I'll fast-forward it after I'm done here to catch it up to master so we won't miss out on anything while running this branch.

[LivacoNew]

Looking at this 2 months on, I'm not happy with how I've implemented this. I've still not got time to work on this, but will hopefully do within a week or so once college is over. Once I do, I'll likely reject this PR and make a new branch and just start over with this, as it's a terrible impl.

[LivacoNew]

Closing this, as this is not even going to come close to being merged. I'll simply redo this in a new local branch and only make an actual PR once I'm happy, like how you're meant to use git.