other: group together config file options and refactor

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Groups together similar config file options. This is a breaking change, and breaks all current config files!

I also took this time to completely redo how configs and args are handled, which cleans up a lot of code and reduces a bunch of duplicate definitions and sketchy code.

TODO before merging:

• Update default config file. Potentially make this autogen rather than a giant constant str.
• Merge together a few duplicate categories. For example, filters, or style.
  • For colours/styles, make custom palettes an enum struct so it's only used if we set a custom palette.
• (Maybe in future PR) Clean up existing code and tests! A lot of this is very messy.
• (Maybe in future PR) Add auto migration tool.
• Update all docs. Add photos of schema usage as well, as follow-up to other: add json schema #1394.
• Update schema. Furthermore, in the future. Probably worth keeping + publishing the existing one as "v1" or something as follow-up to other: add json schema #1394, and the new one as nightly (and v2 on deploy). Done
  • On that note, also gotta figure out how we're doing versioning, then! Done

Issue

If applicable, what issue does this address?

Closes: #

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

Attention: Patch coverage is 79.03431% with 165 lines in your changes are missing coverage. Please review.

Project coverage is 53.52%. Comparing base (79969c7) to head (4453eaa).
Report is 26 commits behind head on main.

❗ Current head 4453eaa differs from pull request most recent head 9a04ad5. Consider uploading reports for the commit 9a04ad5 to get more accurate results

Files	Patch %	Lines
src/options/config/general.rs	1.78%	55 Missing ⚠️
src/options/config.rs	30.66%	52 Missing ⚠️
src/options.rs	89.65%	27 Missing ⚠️
src/options/config/process.rs	57.89%	8 Missing ⚠️
src/options/config/cpu.rs	0.00%	7 Missing ⚠️
src/options/args.rs	95.55%	4 Missing ⚠️
src/options/config/battery.rs	33.33%	2 Missing ⚠️
src/options/config/gpu.rs	66.66%	2 Missing ⚠️
src/options/config/memory.rs	33.33%	2 Missing ⚠️
src/options/config/network.rs	33.33%	2 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1396      +/-   ##
==========================================
- Coverage   55.96%   53.52%   -2.45%     
==========================================
  Files         102      109       +7     
  Lines       18381    17966     -415     
==========================================
- Hits        10287     9616     -671     
- Misses       8094     8350     +256     

Flag	Coverage Δ
macos-12	36.31% <78.90%> (-3.16%)	⬇️
ubuntu-latest	56.08% <78.90%> (-2.49%)	⬇️
windows-2019	36.40% <79.03%> (-3.24%)	⬇️

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