This allows frontends to keep a single loader and use it multiple times
e.g. for code loading and SMDH parsing.

It is of very limited practical utility currently, and will soon be
impossible to support due to more accurate memory map emulation.

Loader: Keep a reference to the file and pass it to the correct AppLoader, instead of loading it multiple times.

- Useful for debugging homebrew

Qt: Updated GUI to support loading .bin files.

- Useful for debugging homebrew

Qt: Updated GUI to support loading .bin files.

- Required "file" handle to be made local and explicitly opened/closed as needed

NCCH: Removed extra qualification ‘Loader::AppLoader_NCCH::’.

NCCH: Updated LoadExec to use Memory::WriteBlock function to load binary code.

Loader: Added ErrorNotUsed ReturnStatus type to specify when something is not used.

- Various cleanups/refactorings to Loader, ELF, and NCCH modules.
- Added AppLoader interface to ELF and NCCH.
- Updated Qt/GLFW frontends to check AppLoader ResultStatus.

NCCH: Removed extra qualification typos.

Loader: Removed unnecessary #include's.

NCCH: Improved readability of memcmp statements.

NCCH: Added missing space.

Elf: Removed unnecessary usage of unique_ptr.

Loader: Removed unnecessary usage of unique_ptr.

- updated load launcher.dat function to use ARM11 format hack