This test just makes sure that created windows match the default
WindowProperties (with a few exceptions).
This also adds the following fixtures:
* graphics_engine - scope='session', GraphicsEngine
* graphics_pipe - scope='session', default GraphicsPipe
* window - scope='test', GraphicsWindow with default framebuffer and window properties
These tests were converted from the tests branch with some changes:
* Convert from unittest to PyTest
* Update code to use new API (LVector3 instead of Vec3, properties, etc.)
rdb
Mitchell Stokes