romfs: Add SingleDiscard extraction type

Needed for manual RomFS extraction, as Full generates an extra directory and Truncated generates variable results.

src/core/file_sys/romfs.cpp

@@ -119,6 +119,9 @@ VirtualDir ExtractRomFS(VirtualFile file, RomFSExtractionType type) {
 
     VirtualDir out = std::move(root);
 
+    if (type == RomFSExtractionType::SingleDiscard)
+        return out->GetSubdirectories().front();
+
     while (out->GetSubdirectories().size() == 1 && out->GetFiles().empty()) {
         if (out->GetSubdirectories().front()->GetName() == "data" &&
             type == RomFSExtractionType::Truncated)

src/core/file_sys/romfs.h

@@ -35,6 +35,7 @@ static_assert(sizeof(IVFCHeader) == 0xE0, "IVFCHeader has incorrect size.");
 enum class RomFSExtractionType {
     Full,          // Includes data directory
     Truncated,     // Traverses into data directory
+    SingleDiscard, // Traverses into the first subdirectory of root
 };
 
 // Converts a RomFS binary blob to VFS Filesystem