Select autopilot during wallet setup.

Dev/fix home balance font size

Dev/grpc mobile error message

[WIP] SCB iOSs & Android

Add note memo on txn detail for payments

Please advise whether to combine & squash with
the original commit

Closes lightninglabs/lightning-app#977

Tested in an iOS simulator, but the feature
should be cross-platform as no UI changes were
needed and business logic was already in place
I could do more cross-platform testing if
necessary. Should be able to test for this
by pulling up any payment made to an invoice
that had a memo field

I tried to match existing code patterns as
closely as possible but not 100% familiar
with MobX anti-patterns

One thing worth mentioning is I expected the
UI to update when selectedTransaction was
mutated but that didn't seem to be the case
so I worked in the async/await before pushing
to TransactionDetail

Also added a few tests again mirroring existing
practices