Summary:
In this diff we persist data about the state of the app when exiting, and to make sure we capture it in crashes, do that as part of track-usage events as well.
with the exit data we also capture what kind of device and plugin the user was using, so that we can detect anomalies like flipper needing restarting more often for certain plugins
during startup, we will always send an event how long it was since the last startup, including the above information
Reviewed By: passy
Differential Revision: D20515200
fbshipit-source-id: ead971e05542e0ef58ed5e5b204af70b51a15b9b
ddf5df98c7
