Major frontend code cleanup (#452)

Many large changes, including:
- TypeScript enums are now string unions throughout
- Strong type-checking throughout the TS and Vue codebase
- Vue component props now all specify `as PropType<...>`
- Usage of annotated return types on all functions
- Sorting of JS import statements
- Explicit usage of Vue bind attribute function call arguments (`@click="foo"` is now `@click=(e) => foo(e)`)
- Much improved code quality related to the color picker
- Consistent camelCase Vue bind and v-model attributes
- Consistent Vue HTML attribute strings with single quotes
- Bug fix and clarity improvement with incorrect hint class parameters
- Empty Vue component objects like `props: {}` and `components: {}` removed

frontend/vue.config.js

@@ -1,6 +1,6 @@
 /* eslint-disable @typescript-eslint/no-var-requires, no-console */
-const path = require("path");
 const { execSync, spawnSync } = require("child_process");
+const path = require("path");
 
 const WasmPackPlugin = require("@wasm-tool/wasm-pack-plugin");
 const LicenseCheckerWebpackPlugin = require("license-checker-webpack-plugin");