The `spacemacs//helm-navigation-ts-set-face` function had been changed to call
the face `spacemacs-helm-navigation-ts-face` with `-ts-`, but the face
definition was still called `spacemacs-helm-navigation-ms-face` with `-ms-`.
Use a custom package name. Also dispatch functions to funcs.el files.
With this default configuration users using ivy instead of helm still
get a good helm base configuration (UI and Key bindings).
