[FS] Add CreateDirectory for MK7 (hopefully not broken)

include/fs/archive_base.hpp

@@ -208,6 +208,11 @@ public:
         return FormatInfo{ .size = 0, .numOfDirectories = 0, .numOfFiles = 0, .duplicateData = false };
     }
 
+    virtual FSResult createDirectory(const FSPath& path) {
+        Helpers::panic("Unimplemented CreateDirectory for %s archive", name().c_str());
+        return FSResult::AlreadyExists;
+    }
+
     // Returns nullopt if opening the file failed, otherwise returns a file descriptor to it (nullptr if none is needed)
     virtual FileDescriptor openFile(const FSPath& path, const FilePerms& perms) = 0;
 

include/fs/archive_save_data.hpp

@@ -8,6 +8,7 @@ public:
 	u64 getFreeBytes() override { Helpers::panic("SaveData::GetFreeBytes unimplemented"); return 0; }
 	std::string name() override { return "SaveData"; }
 
+	FSResult createDirectory(const FSPath& path) override;
 	FSResult createFile(const FSPath& path, u64 size) override;
 	FSResult deleteFile(const FSPath& path) override;
 	FormatInfo getFormatInfo(const FSPath& path) override;