Settings item to limit output power

[AxxAxx]

Implement a setting where the user can limit the output power

e.g.

Limit power
0 - No limit except hard power limits specific for each cartridge type (NT115 - 20W, T210 - 60W, T245 - 120W)
10 - limit power to 10 W
20 - limit power to 20 W
...
110 - limit power to 110 W
120 - limit power to 120 W

[AxxAxx]

Implemneted with commit
6d80659