feat: allow tokenMarker to be configured per Mail instance

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: elpete

models/Mail.cfc

@@ -52,6 +52,7 @@ component accessors="true" {
 			"cc"             : "",
 			"bcc"            : "",
 			"subject"        : "",
+			"tokenMarker"    : "",
 			"additionalInfo" : {}
 		};
 

models/MailService.cfc

@@ -373,7 +373,7 @@ component accessors="true" singleton threadsafe {
 		var tokens      = arguments.mail.getBodyTokens();
 		var body        = arguments.mail.getBody();
 		var mailParts   = arguments.mail.getMailParts();
-		var tokenMarker = getTokenMarker();
+		var tokenMarker = len( arguments.mail.getTokenMarker() ) ? arguments.mail.getTokenMarker() : getTokenMarker();
 		var key         = "";
 
 		// Do not process tokens if using dynamic template (send-grid-protocol)