patterns/zip: Added parsing of extra field (#182)

* zip pattern: Improved fallback method for finding eocd. Added test data to cover this edge case

* zip pattern: added parsing of extra field

includes/std/time.pat

@@ -155,6 +155,15 @@ namespace std::time {
 		return converter.time;
 	};
 
+	/**
+		Converts a FILETIME to unix time.
+		@param value The value to convert.
+		@return Timestamp formatted as unix time.
+	*/
+	fn filetime_to_unix(u64 value) {
+		return value / 10000000 - 11644473600;
+	};
+
 	/**
 		Formats a time according to the specified format string.
 		@param time The time to format.