Virtual Filesystem (#597)

* 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

src/core/CMakeLists.txt

@@ -8,9 +8,9 @@ add_library(core STATIC
     core_cpu.h
     core_timing.cpp
     core_timing.h
+    file_sys/content_archive.cpp
+    file_sys/content_archive.h
     file_sys/directory.h
-    file_sys/disk_filesystem.cpp
-    file_sys/disk_filesystem.h
     file_sys/errors.h
     file_sys/filesystem.cpp
     file_sys/filesystem.h
@@ -20,15 +20,13 @@ add_library(core STATIC
     file_sys/path_parser.h
     file_sys/program_metadata.cpp
     file_sys/program_metadata.h
-    file_sys/romfs_factory.cpp
-    file_sys/romfs_factory.h
-    file_sys/romfs_filesystem.cpp
-    file_sys/romfs_filesystem.h
-    file_sys/savedata_factory.cpp
-    file_sys/savedata_factory.h
-    file_sys/sdmc_factory.cpp
-    file_sys/sdmc_factory.h
     file_sys/storage.h
+    file_sys/vfs.cpp
+    file_sys/vfs.h
+    file_sys/vfs_offset.cpp
+    file_sys/vfs_offset.h
+    file_sys/vfs_real.cpp
+    file_sys/vfs_real.h
     frontend/emu_window.cpp
     frontend/emu_window.h
     frontend/framebuffer_layout.cpp