libscratchcpp 0.12.0

Breaking changes:

• Removed Integer and Double value type, use Number instead.
• Removed Infinity, -Infinity and NaN value types (they're now represented by numbers).

Non-breaking changes:

• Fixed "NaN" casting to false (#593).
• Fixed conversion of -0.0 to string.
• Fixed greater/lower than comparison operators to match Scratch.
• Fixed conversion of NaN to bool.
• Added contains() method to Rect (#419).
• Added clamp() method to Rect (#527).
• Added intersected() method to Rect (#418).
• Added united() method to Rect.
• Implemented KeyEvent::operator== (#455).
• Added layerOrderChanged signal to Drawable (#587).

Full Changelog: v0.11.0...v0.12.0