2.0.0

Breaking Changes

• mouse_position_event signature has changed from (x, y) to (x, y, dx, dy).
  This means you will also be getting the relative position change.
• mouse_drag_event signature has changed from (x, y) to (x, y, dx, dy).
  This means you will also be getting the relative position change.
• KeyboardCamera.rot_state now takes dx and dy instead of x and y

Improvements

• Python 3.8 support (PySide2 will take a few more months. SDL2 has issues on windows)
• Added pygame2 window
• Added window callback iconify for all window types that will be called
  when a window is minimized or restored
• Window property mouse_exclusivity added for all window types.
  When enabled the mouse cursor is invisible and mouse position changes
  are only reported through the dx and dy values.
• Window property size is now assignable for all window types
• Window property position is now assignable for all window types
• Window property title is now assignable for all window types
• Window property cursor is now assignable for all window types
• The KeyboardCamera class should now be better at reducing the
  chance of rotation and movement popping
• All windows now properly separate viewport calculations when
  using fixed and free viewport (derived from window size)
• The window aspect_ratio property should always return
  the a value based on if the aspect ratio is fixed or free
• Added window fixed_aspect_ratio property so users can freely
  control this after window creation