https://happycoding.io/tutorials/processing/collision-detection https://www.gamedevelopment.blog/collision-detection-circles-rectangles-and-polygons/
https://github.com/libgdx/libgdx/blob/master/pom.xmlpackage
com.badlogicgames.gdxlibrary list
https://github.com/rafaskb/awesome-libgdx#readme