How can I pre-raw a Model attribute for the Twig template? (ie. "myModel.myAttr" without requiring the raw filter)
The easiest way i've found to do that is to use TemplateHelper::getRaw()

So in your "prepValue" function inside your fieldtype class do something like this

function prepValue($value) {
    //any other data manipulation stuff
    return TemplateHelper::getRaw($value);
}


More info on prepValue in the docs.