Nuke separate connectors, instead routing everything through the main index.php

This needs a thorough test. I figure the best way to do that is to put it in upstream, allowing more people to test it over a period of time without having to do git-fu with my own repo.

This change not only simplifies core development (AJAX requests correspond one-on-one with the processors, taking out the confusing middle-man at the connector level), but it gets rid of about 125 files (~450kb) in the connectors dir. Users with slow connections or slow ftp servers will thank you. :)

Reup is necessary to update some of the menu actions.