BbCode pages 1.2.1

• Fix toggling bb-code mode on/off in bb-code editor for new pages would cause an internal server error

• Require php 7.2+
• Require XenForo 2.2+
• Require StandardLib v1.18.0+
• Remove unusable preview button (that was next to the save button)
• Fix preview feature could cause errors depending on the bb-code used because of missing default template parameters

• Fix error blocking editing non-bbcode mode pages

• Fix "View attachments to pages" permission was broken for users

• Remove broken preview button on editing a page
• Add "Maximum images" permission for pages, default grant to administrators
• When viewing edit history for a bb-code page; render as bb-code instead of escaping it as html.

• Fix bb-code was still rendered when a page with bb-code is switched to XF template mode.

• Fix possible error when reverting to bb-code page's edit history

• Fix handling of when an admin edits a non-bb-code page and saves it as bb-code. This fixes cases where attachment counter bugs count and doesn't correctly work.
  
  When an admin edits a non-bb-code page from the front-end, the existing template will be rendered to html and then to bb-code. This is a lossy and not particularly reliable process, so it is recommended the original template contents is kept on hand to be manually converted to bb-code

• Add support URL
• Fix "View host content" link generation in attachment browser for bb-code pages