[Feature Request] Add the ability to change gadget name and hostname in setup.cfg

[ch3lmi]

trafficstars

The gadget names and hostname are hardcoded to a value one would not necessarily want to. Especially the gadget name set to something that recognisable will make all DLP products blacklist anything with the name.

Kindly request to be able to set both the gadget manufacturer and product in the setup.cfg file rather than having to changing it manually in init_usb.sh

Also please add the ability to specify the hostname of one's choice in setup.cfg rather that hardcoding it on line 132 of boot_P4wnP1