Implement working libass renderer for subtitles

@types/imsc/index.d.ts

package-lock.json

public/assets/images/logo192.png

public/assets/images/logo512.png

public/assets/js/subtitles-octopus-worker-legacy.data

public/assets/js/subtitles-octopus-worker-legacy.js

public/assets/js/subtitles-octopus-worker-legacy.js.mem

public/assets/js/subtitles-octopus-worker.data

public/assets/js/subtitles-octopus-worker.js

public/assets/js/subtitles-octopus-worker.wasm

public/index.html

public/manifest.json

src/routes/player/Player.tsx

src/routes/player/subtitles/AssRenderer.tsx

src/routes/player/subtitles/SubtitleRenderer.tsx

src/typings/imsc.d.ts

src/util/libass-wasm/SubtitlesOctopus.ts

src/util/libass-wasm/SubtitlesOctopusOptions.ts

src/util/libass-wasm/browserHasAlphaBug.ts

src/util/libass-wasm/browserSupportsWebAssembly.ts