Add basic lua scripting capabilities

[Mm2PL]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

Aware chatterino getting plugins
Example plugin: https://github.com/mm2pl/chatterino-test-plugin
Place in: Chatterino app directory -> Plugins -> test_plugin, then type testing into any chat and notice a bunch of text pop up in the channel. Use /eval to evaluate lua code in the context of the test plugin.
Tree should look like this:

chatterino/Plugins/
└── test_plugin
    ├── index.lua
    ├── info.json
    └── LICENSE

TODO:

• Add reloading
• Add some kind of settings thing and an info json or something
• rebuild settings UI on reload of plugin
• add lua license to settings
• finalize most basic apis and document them, http (another PR) -- will not touch APIs in this PR
• Add a Enable this functionality switch because plugins can probably lead to executing binaries (which is probably
  not desired xd) it's probably not that easy anymore, as direct bytecode execution and dedicated functions for this are blocked
• replace print with a qCInfo call ended up doing qCDebug equivalent + apis to do proper logging
• add a description on what lua plugins can do
• add an option to disable any plugins wanting to use dangerous apis, check it by default permission system material
• Assess the sandboxing of lua, what it could do, how the user's system could be attacked. Plugins can use io, package and os libraries to read/write files, and execute binaries (most notable functions are io.popen, os.execute) Plugins can only use the safe part of the stdlib
• future PR material: Make a version of package that does not have the ability to load native shared libraries, it's nice to have multi-file plugins, you can use loadfile instead i guess
• make the chatterino lua api be in a lua namespace
• check when lua's shared library loading is enabled it's impossible to load native code without require() or package.loadlib, both of which are blocked
• add tests?

Later plans/ideas:

• plugin settings api, each plugin would get a file it gets to save stuff in
• custom completion api, i have this basically ready

Unrelated changes:

• fixes prettier CI to make it print a diff as it should.

[github-actions]

clang-tidy made some suggestions

[github-actions]

clang-tidy made some suggestions

[Nerixyz]

Some really minor stuff I found when trying this PR.

[github-actions]

clang-tidy made some suggestions

[Nerixyz]

LGTM

[github-actions]

clang-tidy made some suggestions

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[github-actions]

clang-tidy made some suggestions

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