Automatically detect USB-PD supply capability and limit power

[AxxAxx]

Automatically ask USB-PD supply of it's power capability with the STUSB4500 negotiation chip and limit the output power based on the capability.

There is currently no such check and if you power AxxSolder with a 65W capable USB-PD source and try to use a C245 cartridge (which will draw 120W) AxxSolder turns off as the supply voltage can not be kept by the supply.