Previously we had a ViewModel class which was responsible for little more than creating an ObservableScope. However, since this ObservableScope would be created implicitly upon view model construction, it became a tad bit harder for callers to remember to eventually end the scope (as you wouldn't just have to remember to end ObservableScopes, but also to destroy ViewModels). Requiring the scope to be specified explicitly by the caller also makes it possible for the caller to reuse the scope for other purposes, reducing the number of scopes mentally in flight that need tending to, and for all state holders (not just view models) to be handled uniformly by helper functions such as generateKeyed$.
* Add support for using CallViewModel for reactions sounds.
* Drop setting
* Convert reaction sounds to call view model / rxjs
* Use call view model for hand raised reactions
* Support raising reactions for matrix rtc members.
* Tie up last bits of useReactions
* linting
* Update calleventaudiorenderer
* Update reaction audio renderer
* more test bits
* All the test bits and pieces
* More refactors
* Refactor reactions into a sender and receiver.
* Fixup reaction toggle button
* Adapt reactions test
* Tests all pass.
* lint
* fix a couple of bugs
* remove unused helper file
* lint
* finnish notation
* Add tests for useReactionsReader
* remove mistaken vitest file
* fix
* filter
* invert
* fixup tests with fake timers
* Port useReactionsReader hook to ReactionsReader class.
* lint
* exclude some files from coverage
* Add screen share sound effect.
* cancel sub on destroy
* tidy tidy
