This is already thought of in orgmode (see hide-leading-stars), we
shouldn't reimplement it in org-bullets. Also it sort of didn't work
in terminals.

* org-bullets.el (org-bullets-bullet-map): Fix documentation style.
(org-bullets-level-char): Add docstring.

* org-bullets.el (org-bullets-face-name): Change customization type
  for nil or a face.  This allows auto-completing a face.

* org-bullets.el (org-bullets-mode): Replace the use of the
  interactive-only function `font-lock-fontify-buffer` to
  `font-lock-flush`.

Remove importing the `cl` feature since it’s not used anywhere

* org-bullets.el (org-bullets-mode): Use `add-text-properties` instead
  of `put-text-property`.  Add higlight mouse-face and help-echo
  message.

* org-bullets.el (org-bullets-compose-leading-stars): Add
  customization variable to set the composition behavior (replace
  characters).
(org-bullets--char-series): Add function to calculate the current
character from a series and the current level.
(org-bullets-mode): Add the series variable.  Add pattern matching
case for setting the series variable according to
`org-bullets-compose-leading-stars`.

* org-bullets.el (org-bullets--bullet-events): Rename
  `org-bullets-bullet-map` to `org-bullets--bullet-events` in order to
  include other event text-properties.
(org-bullets-mode): Use `org-bullets--bullet-events` instead of
hard-coding text properties.

* org-bullets.el (org-bullets-mouse-events): Add this customization
  variable to disable mouse events easily.
(org-bullets-mode): Refactor to only activate mouse events when
`org-bullets-mouse-events` is set.

* org-bullets.el (org-bullets-face-name): Add quote to symbol.

Add several customization variables