Add the ability to sync small, arbitrary key-value strings beween instances

[codabrink]

Integrators would like the ability to sync small arbitrary values between installations.

It would look something like:

client.storeSetting("chatSignature", "\n\n--The above message is not financial advice--")

And then the change would be streamed to other installations for that user, with the apps being notified of the change so they can update appropriately.