Initial pre-release version of `py_cui`.
Features Added
* Collection of default widgets
* Popup support
* Loading icon support
* Ability to switch between windows
* Ascii based interface renderer
* Basic text color options
* Grid layout manager
* Automated CI/CD unit testing with TravisCI
Known Issues
* Windows version does not seem to pull `windows-curses` from pypi automatically
* `move_focus` does not reset status bar text
* Docs are incomplete
Future Plans
* Improved layout management
* More intuitive color rule definition
* `py_cui_constructor` helper script for building `py_cui` interface templates
* Code cleanup and bug fixes