Implement basic DASH handling

package-lock.json

package.json

src/App.tsx

src/api/ApiClient.ts

src/api/ApiClientContext.ts

src/api/models/Content.ts

src/api/models/ContentDescription.ts

src/api/models/ContentId.ts

src/api/models/ContentKind.ts

src/api/models/ContentName.ts

src/api/models/Instalment.ts

src/api/models/dto/ContentMeta.ts

src/api/models/dto/GenreWithContent.ts

src/api/models/dto/TitleMeta.ts

src/routes/ContentRoute.tsx

src/routes/main/MainPage.tsx

src/routes/player/Player.tsx

src/routes/player/PlayerPage.tsx

src/routes/player/SeekBar.tsx

src/routes/player/video/DashVideoElement.tsx