Updates library to release 2.4.2, and bundles "forest" sample that showcases the new features introduced in release 2.4.0:

• object layers for props/decorations
• layer linking
• spriteset-based animations

Graphic assets used for "Forest" sample are provided by ansimuz, from his "Sunny Forest" asset pack:
https://ansimuz.itch.io/sunnyland-forest

Windows and raspberry packages are updated, for dekstop linux and OSX please build from source