Moving some DataConnector related classes over to -api

[Rod Widdowson]

> The reason that this is needed goes back to the fact that the parsing for spring-resources is done in an entirely different
context
> (we do not inherit global.xml) so we need to respecify everything at the top if we want to use it.

But I'm wondering whether we can fix this inside our code by forcing the default-initializer into place before we start parsing.
I'll investigate.