We don't need to do the lookup if the path is considered empty
currently.

Allows frontend to create registration caches for use before a game has booted.

Avoids the need to rebuild these source files if the mode header
changes.

Avoids the need to rebuild multiple source files if the filesystem code
headers change.

This also gets rid of a few instances of indirect inclusions being
relied upon

Adds the basic skeleton for the remaining fsp services based off
information provided by Switch Brew.

* Regression and Mode Fixes

* Review Fixes

* string_view correction

* Add operator& for FileSys::Mode

* Return std::string from SanitizePath

* Farming Simulator Fix

* Use != With mode operator&

Avoids unnecessary construction of std::string instances where
applicable.

Instead of using an unsigned int as a parameter and expecting a user to
always pass in the correct values, we can just convert the enum into an
enum class and use that type as the parameter type instead, which makes
the interface more type safe.

We also get rid of the bookkeeping "NUM_" element in the enum by just
using an unordered map. This function is generally low-frequency in
terms of calls (and I'd hope so, considering otherwise would mean we're
slamming the disk with IO all the time) so I'd consider this acceptable
in this case.

It is unknown if this is correct behavior, but it makes sense and fixes a regression with Stardew Valley.

Avoids unnecessary atomic reference count incrementing and decrementing

This is simply a basic value check as opposed to potentially doing
string based operations (unlikely, but still, avoiding it is free).

This was just an artifact missed during PR review.

* Virtual Filesystem

* Fix delete bug and documentate

* Review fixes + other stuff

* Fix puyo regression

Previously this wouldn't compile, since no such function named
SaveStructDebugInfo() exists.

This reverts commit 77c684c1.

* Add VfsFile and VfsDirectory classes

* Finish abstract Vfs classes

* Implement RealVfsFile (computer fs backend)

* Finish RealVfsFile and RealVfsDirectory

* Finished OffsetVfsFile

* More changes

* Fix import paths

* Major refactor

* Remove double const

* Use experimental/filesystem or filesystem depending on compiler

* Port partition_filesystem

* More changes

* More Overhaul

* FSP_SRV fixes

* Fixes and testing

* Try to get filesystem to compile

* Filesystem on linux

* Remove std::filesystem and document/test

* Compile fixes

* Missing include

* Bug fixes

* Fixes

* Rename v_file and v_dir

* clang-format fix

* Rename NGLOG_* to LOG_*

* Most review changes

* Fix TODO

* Guess 'main' to be Directory by filename

This makes the formatting expectations more obvious (e.g. any zero padding specified
is padding that's entirely dedicated to the value being printed, not any pretty-printing
that also gets tacked on).

Tidies up namespace declarations