Usage metrics

ApplicationCache is not threadsafe, if it gets instantiated on the wrong
thread Unity will throw.

Don't fail the bash build if xbuild borks at copying things (it usually does if Unity is open already)

Functionality to initialize the MetricsService dynamically on load; Better control over when those elements are sought after for compilation

Fixes to Signout and Keychain handling of missing credentials

Isolate time sensitive tests