HeapsIO quickstarters

Samples on how to implement customary game features with the HeapsIO API.

"astro shooter"

• very close to the HeapsIO API, no custom Entity class etc.

"astro shooter" (performance boosted version)

• no findAll() in the game's update() loop to gain performance
• requires maintaining Haxe arrays instead

"RPG"

• Sample on how to implement the HeapsIO h2d.Camera and separating world and UI by h2d.Scene's h2d.Layers