Add ability to register hooks and filters as a service

    services:
      fm_bbcode.filter.bar:
        class: %fm_bbcode.filter.bar.class%
        tags:
          - { name: fm_bbcode.decoda.filter, id: bar }

      fm_bbcode.hook.bar:
        class: %fm_bbcode.hook.bar.class%
        tags:
          - { name: fm_bbcode.decoda.hook, id: bar }