Change default/preferred HTTP server to falcon?

[postmodern]

Since webrick is no longer available in the stdlib by default (but available as a separate gem in Ruby >= 3.0.0), perhaps we could switch to using falcon. Falcon is a Rack compatible, pure-Ruby, async HTTP server.

[postmodern]

Since Ronin::Web::Server::Base inherits from Sinatra::Base, and Sinatra is still working on Falcon support, this will have to be tabled. WEBrick for now I suppose.