Issue #41: Part I (preview only)

This is a rough cut of event listener registration and delivery layer, without any actual event firings wired into all the pertinent places - that'll be part II.

I would like some feedback on this though, since it's doubtful this is in a state where it can be merged, but logically this is a good place to split up the work in two parts.
Hmm, I don't know where you see `CacheConfiguration` here but perhaps you're talking about other bits? I don't really have an issue with dropping event listener support in StandaloneCacheBuilder, but I think you mentioned that 107 kind of requires us to go through CacheRuntimeConfiguration for event listener registration?