Some slightly changes to the API for Command.
- You can now use the OptionParser for commands which enables options from string and from array
- The OptionParser is completly static now
- You can not have different default modes in different GetOpt instances
Because the OptionParser is static now the default mode is a public static property too. All instances from GetOpt and Command use the same default mode. For backward compatibility you can still use the SETTING_DEFAULT_MODE
for GetOpt.