Add system.xml dumper

[V10lator]

Depends on #20 / #22

[GerbilSoft]

It might be worth reworking the "Dump OTP/SEEPROM" function to be a more general "Dump essential files" function, which would dump OTP, SEEPROM, the various XML files, and maybe some other important files to a directory named using the system serial number. Adding a separate dump screen for each type of file seems like a waste.

Should keep "OTP/SEEPROM" on the main menu entry though, so people know that's where it is. ("Dump OTP/SEEPROM and XML files" maybe?)

[V10lator]

The current plan of Jan and me is to add a NAND dumper, too (Jan is currently working on that), then add a dump anything option so people with none working display output can dump with ease.
Not sure how useful it would be to combine OTP/SEEPROM and xml dumping into a single option. In case you don't want too many dumping options on the main menu it might be be more feasible to add a dumping submenu?

@GaryOderNichts any thoughts on this?

[GaryOderNichts]

The current plan of Jan and me is to add a NAND dumper, too (Jan is currently working on that), then add a dump anything option so people with none working display output can dump with ease. Not sure how useful it would be to combine OTP/SEEPROM and xml dumping into a single option. In case you don't want too many dumping options on the main menu it might be be more feasible to add a dumping submenu?

@GaryOderNichts any thoughts on this?

I think a dump menu with several suboptions for dumping would be nice.
Could even add a "Dump All" or "Dump Essential" option at the top of the menu to allow easily navigating this without video.
It should be good enough for now though. There's going to be a lot of refactoring, before the next release anyways.