feat(App): refactor App and split it into BaseApp and App
BaseApp does all the heavy-lifting related to creating the redux store,
navigation, and so on.
App currently handles URL props and actually triggering navigation based on
them.
[RN] Legacy support of calendar-sync's knownDomains
Knowledge is power, man!
We moved "knownDomains" from calendar-sync to base/known-domains.
However, we do have an official release in the app stores and I'd like
us to not throw away the knowledge it has acquired.