Minor refactoring + move hardcoded template names and handling based mustache variables into a const collection for ease of modification/access

src/utilities.cpp

@@ -20,9 +20,11 @@
 #include "cpp/htmlmessage.hpp"
 
 #include "emailTemplateCollection.cpp"
+#include "templateConstCollection.cpp"
 
 using namespace jed_utils::cpp;
 using namespace DatabaseStatementConstCollection;
+using namespace TemplateConstCollection;
 
 /*
  * Utility Manager