This makes clang-format useful on those.

Also add a bunch of forgotten transitive includes, which otherwise
prevented compilation.

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

Add error popup when citra initialization failed

Make `Loader::LoadFile` return an `ErrorNotImplemented` if you call
it on a CIA file.

Make `GetFileTypeString` return ‘CIA’ for CIA (CTR Importable
Archive) files.

memory.cpp/h contains definitions related to acessing memory and
configuring the address space
mem_map.cpp/h contains higher-level definitions related to configuring
the address space accoording to the kernel and allocating memory.

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

This has been obsoleted by the field in Process.

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