Add visible property to all UIDrawable objects
Add parameter documentation to Python methods
Replace placeholder docstrings with real documentation
Add pos property as Vector alternative to x,y properties
Add position tuple support to Frame and Sprite constructors
Add scale_x and scale_y properties to UISprite*
Standardize sprite_index property name across objects*
Rename Caption.size property to font_size
Color r, g, b, a properties return None
Error message on
grid.at does not explain which value was invalid well
Animations - interpolate between values over time for most UIDrawable fields
Sprite: test index before accessing Texture
UIEntityCollection + UICollection .extend