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: my_filter_id }

      fm_bbcode.hook.bar:
        class: %fm_bbcode.hook.bar.class%
        tags:
          - { name: fm_bbcode.decoda.hook, id: my_hook_id }

<table>
  <tr>
    <th>Q</th><th>A</th>
  </tr>
  <tr>
    <td>Bug fix?</td><td>no</td>
  </tr>
  <tr>
    <td>New feature?</td><td>yes</td>
  </tr>
  <tr>
    <td>BC breaks?</td><td>no</td>
  </tr>
  <tr>
    <td>Tests pass?</td><td>yes</td>
  </tr>
  <tr>
    <td>License?</td><td>MIT</td>
  </tr>
</table>