Remove deprecated code

[davidism]

Remove any code that raises a deprecation warning for 1.0.

• contrib
• Headers.to_list in favor of Headers.to_wsgi_list
• debug.debug_repr alias for debug.repr.debug_repr
• DebuggedApplication unused lodgeit_url parameter.
• Aliases in http for datastructures: CharsetAccept, Headers, LanguageAccept, MIMEAccept
• ProxyFix num_proxies parameter and attribute, get_remote_addr method, environ keys moved to werkzeug.proxy_fix.orig
• test.File alias for datastructures.FileStorage
• Adding files to test client as dicts, use FileStorage or a tuple instead.
• useragents.UserAgentMixin alias for wrappers.user_agent.UserAgentMixin
• utils.escape unused quote parameter
• Aliases in utils for datastructures: CombinedMultiDict, EnvironHeaders, Headers, MultiDict ; and for http: dump_cookie, parse_cookie
• BaseRequest.is_xhr
• wsgi middleware moved to middleware: ProxyMiddleware, SharedDataMiddleware, DispatcherMiddleware