WIP: Stability uia timeout/lost write/read - Do not merge

This pull request enables extended measures to mitigate the issue of lost writes and reads to preferences across the UIA process and Calabash (see https://github.com/calabash/calabash-ios/issues/585).

# Work in process - do not merge (yet)

We will do a number of pre-releases of the server component to measure the effect of the mitigation so we can conclude if we're looking at a fix or not.

There are another of set of routes we can go down if not.