private byte partFromString(String part) {
        if (part.equals("x")) {
            return -1;
        } else {
            return Byte.valueOf(part);
        }
    }
Unity engine version string container.

@author Nico Bergemann <barracuda415 at yahoo.de>
disunity-core/src/main/java/info/ata4/junity/UnityVersion.java