Added support for AXUnknown windows.
Small bug was fixed in class_id property of AppleEventDescriptor class.
Updated docstring for get_axunknown_windows() method.
Merge pull request #5 from F1ashhimself/feature/support_for_AXUnknown_windows

Feature/support for AXUnknown windows
Fixed issue that set_focus method for MacElement was marked as property.
Updated mouse implementations for Win OS and Mac OS.
Merge pull request #6 from F1ashhimself/feature/refactoring_of_mouse_module

Updated mouse implementations for Win OS and Mac OS.
Merge pull request #7 from F1ashhimself/develop

Updating UISoup to version 2.1