CardStock v0.99.6

This is a minor CardStock update. It includes:
• Update to Python 3.11.9
• Add animation easing
• Add shape.pen_style for dashed lines
• Change broadcast_message() from function to methods on stack and card objects
• Add an inspector for the stack object, move on_exit_stack() event to the stack
• Rename button.title to button.text
• Rename ColorRGB/ColorHSB -> color_rgb/color_hsb
• Improve context-help data
• Small performance speedups
• Bug fixes / Minor UI improvements