* Reorganize namespaces
- Most types are now moved into the `melonDS` namespace
- Only good chance to do this for a while, since a big refactor is next
* Fix the build
* Refactor diskio's contents
- Change ff_disk_read_cb/write_cb into a std::function instead of a raw pointer
- Add const specifiers as needed
* Refactor DSi_NAND to manage the file system's mounted lifetime with RAII
* Split NANDMount into NANDMount and NANDImage
- NANDImage is used for information about the NAND that doesn't require decryption or filesystem access
- NANDMount is used to actually access the file system
- Both classes manage their respective resources (the NAND file handle and the NAND's mount) with RAII
- Also split the file loading into another function that I will remove in a later PR
* Make NANDMount immovable
* Remove NAND-loading code that I had sectioned off into a function
- Incomplete copypasta
- I must have gotten distracted
* Tidy up NANDImage's initialization
- Don't unmount the disk image if the constructor fails (that's NANDMount's job now)
- Only assign CurFile if the constructor succeeds
* Add some const-correctness
* Move DSi NAND initialization to the frontend
- The NANDImage is now installed via a unique_ptr in DSi
* Remove Platform::DSi_NANDPath
- Not Config::DSiNANDPath; that can still be configured as usual
- The core no longer needs to care
* Add a definition for TMD files
* Wrap TitleMetadata in a namespace
* Add a comment
* Remove TitleMetadataCertificate
- melonDS ignores it anyway
* Refactor the use of title metadata
- Move bitwise operations on the title ID into helper methods
- Use TitleMetadata objects instead of pointers to raw data
* Slight cleanup in DSi_NAND
- Replace some constants with sizeof
- Use an NDSHeader object instead of a raw array of bytes
* Add a DSi_NAND::ImportFile overload that loads a file from memory
* Split most of ImportTitle into InitTitleFileStructure
- It will be reused in the next commit
* Add ability to import title from memory
* Fix another potential issue
* Fix broken DSiWare installation
- The bytes of the title ID/category were being swapped in most places, but not all
* Add some logging calls
* Declare array sizes in DSi_TMD in decimal, not hex
* Add a space after the #endif
- To adhere to the style guide
* Assert the size of TitleMetadataContent
* Change the type of SignatureName
* Don't mark the TMD structs as packed
* Remove extraneous comments
* Cut down some newlines
