Move matching code from fps to mcs, and allow switching matching implementations.

The spot-to-fiber matching is currently done on the fps side. We have two matching algorithms (the simple cobraCharmer one, and the functions in the mcsActor), and would like to be able to compare them. Besides that, we have agreed on a cobra_match table to hold the match data.

So the fps-based match code can and should be moved to the mcsActor.