SI: Update example Module/Entities classes to have security in the setters

[WillStrohl]

Is your feature request related to a problem?

When accepting user input values, it's a best practice to clean them by running the value through the PortalSecurity.InputFilter() method. We should just add that to the setters in the template so that the module will automatically be more secure by default. If someone needs to adjust it, they can lower the security level of the flag or remove it.