Refs #11035 use Path:: for paths that are defined in config. Except for Log & absolute paths... they need more work.

Feature #6314 - HTML Mode & sendMailSubjectHtmlEntity for Forms. Also fixed some issues with Documentation and implementation.

HelperFormElement.php, SessionCookie.php, Html2Pdf.php, Store.php, Constants.php: migrate to camel case on configuration variables.
Config.php: readConfig() reads now config.qfq.ini and T3 LocalConfiguration.php.

AutoCron.php: allow https connections with invalid certificate (e.g. 'localhost' is not listed as a valid hostname).
Manual.rst: Enhance best practice to setup AutoCron.

AutoCron.php: Fix problem with array in checkForOldJobs(). Implement check that re-trigger asynchronous cron jobs are handled correctly.

AutoCron.php: New constants   AUTOCRON_STATUS_OK, AUTOCRON_STATUS_ERROR. Status Length not limited anymore.

Manual.rst: updated to the latest autocron features.

Autocron: implement a) 'output to a file' (content of the retrived page), b) search for a pattern on the output.
Manual.rst: updated to the latest autocron features.

AutoCron: Added doc for autocron. Extend AutoCron.php to be MultiDB aware. Update der AutoCron form.

sendMail refactored - AutoCron.php,Report.php,SendMail.php: SENDMAIL_IDX_* replaced by SENDMAIL_TOKEN_*

SendMail.php: renamed file and class from 'sendmail' to 'sendMail'. Remove obsolete function buildHeader().
AutoCron.php: Update use of class sendMail().
FormAction.php: rename function sendmail(0 to doSendMail().
Report.php: remove unnecessary code. Move sendmailConvertToken() to class sendMail / parseStringToArray().

AutoCron.php: STORE_PARENT will be filled with - Webpage: either the current cron job, Mail: the current Mailrecord (sql1). Use them with {{....:PE:all}}