* Begin refactoring NCA classes
* Section opening
* Add NcaNewExtensions
* hactoolnet: Move most nca code to the new api
* Verify nca signatures
* hactoolnet: process patched ncas
* Add NCA encryption counter generation method
From what I can tell, this is the current method used to generate the counter. It's possible that may change in the future.
* Verify NCAs
* Use NcaNew in SwitchFs
* Remove old NCA code
* Rename new NCA classes
* Move struct constants around
* hactoolnet: verify patched nca sections
* Misc