Make `CallHandler` more `EventEmitter`y#18823

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SimonBrandner wants to merge 2 commits intoelement-hq:developfrom SimonBrandner:task/call-handler-emittery

+8-7

Commits on Aug 28, 2021

Use CallState event instead of dispatcher
SimonBrandner
committed

Commits on Sep 11, 2021

Merge remote-tracking branch 'upstream/develop' into task/call-handler-emittery
SimonBrandner
committed