Add :editor multiple-cursors module

Moves evil-mc/evil-multiedit out of feature/evil.

init.example.el

@@ -47,6 +47,7 @@
        window-select     ; visually switch windows
 
        :editor
+       multiple-cursors  ; editing in many places at once
       ;parinfer          ; turn lisp into python, sort of
        rotate-text       ; cycle region at point between text candidates