move cherrpy server support to tiddlywebwiki

Modern tiddlyweb just uses the wsgiref server.

The presumption here is that there are three classes of server
uses:

* dev and debug where wsgiref is okay
* personal/group install of tiddlywebwiki, where some speed is good
  thus cherrypy
* big instance, where apache + mod_wgsi or nginx + uwsgi will be
  used
prep 0.65 release