com_connect v4.9.0

Feature and maintenance release to coincide with Textpattern 4.9.0:

• For Textpattern 4.9.0+ only.
• Hook into core's email workflow, sending via internal mail or SMTP accordingly.
• Bake spam-protection tools into the plugin:
  ** action attribute for the <txp:com_connect> tag.
  ** delay attribute to foil automated form-filling scripts.
  ** <txp:com_connect_expect> and expected attribute to check submitted values.
• Add support for file attachments via <txp:com_connect_file />.
• Add <txp:com_connect_header> tag for adding arbitrary email headers.
• Deprecate <txp:com_connect_mime> in favour of the wrapper <txp:com_connect_body> tag.
• Fix com_connect_serverinfo not returning values (thanks, whocarez).
• Fix Passing null to function in PHP 8 (thanks, peterj and jools-r).