Core python api for zootools

Zoo adds to the current environment, These variables accept multiple paths just make sure you create them before the startup process.

• ZOO_BASE
• ZOO_ICON_PATH
• ZOO_COMMAND_LIB

Zoo uses the follow third party wrapper. https://github.com/mottosso/Qt.py.git

The location in zoo is expected to change to the thirdparty package under zoo but until then here's how you currently import it

from zoo.libs.pyqt.qt import QtWidgets

Zoo.pyqt has a number of extensions to qt widgets, views and models.