Zarchive Loading (#724)

* Simplify archive loading and harden filesystem integration

* Restore directory entry name length assertion

* Keep graphics-dependent filesystem tests out of CI

---------

Co-authored-by: nmzik <Nmzik@mail.ru>

src/common/file.h

@@ -7,6 +7,7 @@
 #include <cstddef>
 #include <filesystem>
 #include <memory>
+#include <optional>
 #include <string>
 #include <vector>
 
@@ -34,6 +35,10 @@ public:
 		std::string name;
 		bool        is_file;
 	};
+	struct Info {
+		bool     is_file;
+		uint64_t size;
+	};
 
 	File();
 	explicit File(const std::filesystem::path& name);
@@ -72,6 +77,7 @@ public:
 	std::vector<std::byte> ReadWholeBuffer();
 
 	static uint64_t Size(const std::filesystem::path& name);
+	static std::optional<Info> GetInfo(const std::filesystem::path& name);
 
 	static bool IsDirectoryExisting(const std::filesystem::path& path);
 	static bool IsFileExisting(const std::filesystem::path& name);