Create method to do global site notice

[jamesmontalvo3]

Need to easily put banners at the top of all wikis, and optionally at the top of select wikis without editing the [[MediaWiki:Sitenotice]] page.

[jamesmontalvo3]

This is very easy to add as a hook like:

      public static function onSiteNoticeAfter( &$siteNotice, $skin ) {

        $systemNotice = file_get_contents( '/opt/system-banner.mediawiki' );
        if ( $systemNotice ) {
          $siteNotice = $systemNotice . '<div id="localSiteNotice">' . $siteNotice . '</div>';
        }

      }

To make this better for a system-wide banner:

• single shared database table for meza?
• make banners have option for auto styling
• Special:MezaAdmin (?) allows editing messages (amongst other things)
• One message for during deploys.
• Allow setting system-wide read-only from this (with associated message)
• only access special page from primary wiki?