Add variation Mail action
Add warning on wrong template for mail/page
Add PaymentManager and mails on connector
Fix comments and code formatting.
Add handling of substitution-variables attribute on rich-text-input (BO)
This attribute should contain a JSON with one of the following contents:
 - an array (ex: ['subsitution1', 'substitution2', ...]
 - an object (ex: {'substitution1': 'Label1', 'substitution2': 'Label2', ...}
New static method getSubstitutedString on \Change\Stdlib\String to apply substitutions.
Update admin document routes declaration