Refactor to 2021 standards

[rossjrw]

Alright. This is going to be a big one. I may need to split it out into multiple PRs as convenient.

The gist at the time of writing is that I have an old spreadsheet-based CoffeeScript project, and a partially-converted TypeScript project from the previous version of this PR. I also have a whole bunch of planning for an entirely new plot, and a whole bunch of writing for an old one. So, I'm going to scrap all the work I did converting that stuff to the new format (as well as the new format itself), and start over from scratch - but this time with an actual configuration format. I can then cherry-pick anything worth keeping from the old stuff as and when I want it.

Cleaning up

• Delete all the old events
• Scrap the spreadsheet and LoopService.js
• Scrap anything that requires the .gitattributes
• Scrap jQuery
• Scrap AngularJS
• Don't commit builds (dist/)
• Scrap old images, where appropriate
• Convert CSS to SCSS (closes Switch to SCSS #39)
• Use SCSS variables in place of CSS variables where appropriate
• Set up Prettier
• Run Prettier in pre-commit
• Add updated licensing info (README.md and LICENSE)

Engine

• Scrap CoffeeScript
• Convert everything to TypeScript
• Create a shitload of Vue 3 components
• Split HTML across Vue components
• Make the Vue components work
• Try to keep Maitreya logic and game engine logic isolated from each other (e.g. replace aic.bootUp with a game start hook callback, or something)

Styling

• Split CSS across Vue components
• Replace animations/transitions with Vue stuff where appropriate
• Vet all usage of the transition property and ensure it is never set to all
• Scope CSS where appropriate (i.e. most of the time), bearing in mind that a combinator is needed to select elements in child components

Build process

• Build and deploy automatically with GitHub Actions
• Isolate anything English into a language dir, like I did for 3211
• Create a language-agnostic bundle via Webpack

Events

• Create a basic TOML JSON event file with some sample interactions (closes move LoopService.js compilation from google sheets to internal #23)
• Create UI for editing the interactions (will be done in Add an event editor #41)