Use user-templates for printers#416

If I have 100 printers consisting of 5 types, I now have to add each of the 100 separately and configure them each…

This is a waste of time and also error prone if there are differences for the same type.

Instead, let me make 1 template using the general workflow e.g. I select a Creality K2 and several options moonraker of fluid etc etc.

Next, I can add 20 printers based on that template of mine and only change the ip, add to 1 or more queues and done.