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
* 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
