Bug 971459 - [System2] Instantiable Applications.
Bug 976846 - Update active app earlier
Merge pull request #16682 from alivedise/bugzilla/976846_bubble-tea/update-active-app-early

Bug 976846 - Update active app earlier, r=timdream
Merge pull request #16779 from mpizza/Bug_971459_fixed

 Bug 971459 - [System2] Instantiable Applications. r=alive.
Bug 971458 - [System2] Instantiable AppWindowFactory
Bug 976846 - fix lint
Merge pull request #16790 from alivedise/bugzilla/976846_bubble-tea_followup

Bug 976846 - fix lint, r=me.
Merge pull request #16607 from luke-chang/971458_instantiable_app_window_factory

Bug 971458 - [System2] Instantiable AppWindowFactory, r=alive
Bug 971473 - [System2] Instantiable CallForwarding

- update bootstrap_test
- add related tests for call_forwarding
- refactor call_forwarding