For Simple AF for RPI add a --model argument

[pellcorp]

So for users who are using their own base printer or for those that are just pointing at a url, it would be useful to flag as part of an initial installation that they are using that mainboard on a specific supported printer being one of:

• K1 (which includes k1c)
• K1M
• K1SE (to factor in no chamber fan, not sure its needed)
• Ender 5 Max
• Ender 3 V3 KE
• Ender 3 V3 SE

We would add the correct # MODEL: header to the printer before saving it to the printer.factory.cfg file, and users would need to specify a mount override.

Im not sure its the right way to go, some further pondering required.

[pellcorp]

I changed my mind, each base printer should be for a specific model if applicable