Fixes #1324

Fixes #1321

Actually same issue as #1312

Intent extras are only supported in v1 mode, but CWA also accesses them in
ExposureWindow mode, which can result in ClassNotFoundException in optimized
builds.

Fixes #1325

Some apps make excessive use of this method, so better not log it

This increases stability/durability of these services in case of crashes

This hides the fact that the key was rotated. Probably never needed because one
is not going to get infected twice within 14 days, but doesn't hurt either.

Fixes #1318

Include newly added devices and corrections published 2020-12-14

Fixes #1312

The service is also used under the brand Firebase Cloud Messaging

Useful when bundling the library with EN apps.

This requires rotating the daily TEK when exporting

The exposure-notifications-internal suggests that this is the thing to do,
but the actual implementaton doesn't.

Useful for small screen + large font devices