- adapterRequestFactory: for easier API response stubbing
- assertRelationships: for checking model relationship data

Also

- deeply clone mocked adapter response
  the TwitchSerializer will normalize the response object in-place

TwitchAdapter:
- remove "Accept" header
- change OAuth token to Bearer token
- remove urlFragments and AuthService injection
- refactor findId logic
  - use same param name for findRecord and findMany
  - fall back to serializer's primaryKey if findIdParam is null
  - switch to helix API's multi-ID serialization style
  - limit number of ID requests via findIdMax

TwitchSerializer:
- change default primaryKey from "_id" to "id"
- normalize "data" payload property
- treat everything non-"data" as metadata

- TwitchChannelFollowed
- TwitchRoot
- TwitchSearchStream
- TwitchStreamFeatured
- TwitchStreamSummary

- remove FeaturedRoute and update application router
- change default homepage to StreamsRoute
- add update logic for local storage
- remove/change links, update MainMenuComponent and fix translations
- remove FeaturedRoute hotkeys and update hotkeys for other routes

- remove filtering logic
- simplify willFetchContent
- simplify hasFetchedAll
- split calcFetchSize into calcFetchSize + setFetchSize
- remove most Ember.get calls
- rewrite tests, split up into CSS and Mixin tests

- add InfiniteScrollPaginationMixin based on InfiniteScrollCursorMixin
- remove InfiniteScrollOffsetMixin and InfiniteScrollCursorMixin
- replace imports in various routes with InfiniteScrollPaginationMixin
- fix InfiniteScrollCommonMixin and wait for mapped promises to resolve

Next:
- fix each route's infinite-scroll and pagination parameters
- fix each route's model hooks and related stuff
- test pagination mixin via route tests

- reference games by ID instead of names in GamesGameRouter
  This will break custom game homepages, but there's nothing that can
  be done here to automatically fix this. Users will have to reset their
  custom homepage.
- inherit from UserIndexRoute
- fix infinite-scroll / pagination parameters
- reformat templates

- inherit from UserIndexRoute
- fix infinite-scroll / pagination parameters
- reformat template

- fix infinite-scroll / pagination parameters
- remove custom model hook for the old kraken API bug and remove tests
- reformat template

- fix infinite-scroll / pagination parameters
- remove controller and query parameters for sorting (unsupported now)
- reformat template

- update route parameter name in router
- inherit from UserIndexRoute
- fix/rewrite model hooks
- fix infinite-scroll / pagination parameters
- reformat templates

- update route parameter name in router
- inherit from UserIndexRoute
- fix/rewrite model hooks
- reformat templates

Querying random streams is not possible anymore on the helix API, as
there's no available offset query parameter. At most 100 streams can be
queried in one request and then new requests can be made with the
provided pagination cursor query parameter. This means that finding
random streams becomes unnecessarily expensive at a certain point.

- remove "streams" filter
- remove old and unused label code
- add localStorage update logic and add tests

- update addRecord logic and add tests
- reformat template

- inherit from UserIndexRoute
- fix/rewrite model hooks
- reformat template