Various bugfixes (python 3 and others)

[EccoTheFlintstone]

Various bugfixes:

• python 3 print support
• XML ElementTree tostring() encoding fix : 'utf-8' is not a valid encoding under python3 (only 'us-ascii' and 'unicode' are supported, but 'unicode is unknown under python2) , so a bytestring is created instead. In this case, convert it back to utf-8 encoded string(if a scheduled task with a "Data" tag under ComHandler is found for instance)
• bugfix : Settings data are under the 'Settings' XML tag (for instance 'enabled' or 'hidden') . See https://docs.microsoft.com/en-us/windows/desktop/taskschd/task-scheduler-schema for full XML schema