Fixes

• Fix Flat.Rectangle.render(), now with optimized subdivision instead of quads.
• Fix Flat.Rectangle.Outlined.render() in mode NORMAL, now render with the original rectangle.
• Fix AccurateColor AccurateColor.mix(AccurateColor another, double ratio, MixMode mixMode), behave better in mixing with TRANSPARENT.

Additions

• Add boolean AccurateColor.hasOpacity().
• Add Vector Box.at(double xOffset, double yOffset).
• Add 2 alias for Box render methods.
• Add Texture Texture.uvAt(double xOffset, double yOffset)

Deletions

• Delete Flat.Rectangle.Transformed.class