Feature Request: Display keys.txt/prod.keys used and load keys from multiple locations

[LittleStinky123]

I wasted a little too much time figuring out why Switch SD Tool couldn't parse the nca of the newly released Bravely Default 2 Demo.
It actually stopped looking for keys after it found the outdated prod.keys I had place at ~/.switch/prod.keys and didn't even parse the keys.txt in the Switch SD Tool directory I provided.
Could you log where the used keys are located or try to load keys from all possible locations if possible?

[My1]

ideally some updated instructions in general would be useful like considering modern dumping generally involves prod/titlekeys, is prodinfo still needed? or making it possible to just point to a system.bin dump instead of the partition needing to be mounted, whatever reason that thing is needed for