Vi improvements and key binding configuration

• Fixed PrintWriter->on name collision warning for Clojure 1.9
• Added additional vi like bindings for clojure actions to :vi-cmd key map
• make readline history file project local
• make it easier to alter-var-root core repls to rebel-readline repls
• fix blow up when COLORFGBG isn't formatted correctly
• fix repl key-map swtiching feedback
• add a clojure-force-accept-line widget that submits a line regardless
• allow key binding configuration in the rebel_readline.edn config file