Allow use of CiviCRM tokens instead of Smarty variables

[jensschuppe]

Currently, only contact tokens are explicitly supported in templates used for sending with this extension, but with a deprecated method CRM_Utils_Token::replaceContactTokens(). No other tokens are supported which makes it hard to extend on the functionality.

This extension should implement token replacement using CiviCRM's Token framework and deprecate the Smarty variables it is currently defining as placeholders.

[bjendres]

Makes sense. What is the minimum CiviCRM version for that?

[jensschuppe]

I think 4.7 - if we're not planning to provide our own tokens using some new stuff in Core, then it would be 5.44. Not sure about those special variables for multi-value fields of events (sessions, speakers, etc.) and special formats - maybe they can be handled with default custom field tokens.

Anyway, version 2.0 of the extension should not not move forward because of supporting legacy stuff.