* Avoid performing any crypto operations on null NCA key area entries.
* Added commented out code to handle the aes_ctr_ex NCA key area entry, just in case we end up needing it at some point.
These files will be modified to slowly add features from the nxdumptool rewrite codebase.
This commit effectively makes it impossible to build the previous PoC. The code from each PoC will be reused, though, so it hasn't been removed.
* Remove references to the secondary Nintendo Extended BFTTF because it's identical to the first one.
* Use format attribute in functions that need it (and fixed errors I made in the past).
