Alternativa3D 8.27.0 with shadows and alpha-test

Continuing this week’s long-awaited release of the new version of the engine Alternativa3D. It implements the shadow of the directional light needed, for example, to correct image shadows in the sunlight. We also added the ability to draw using the alpha-test technology, and the two-pass alpha-test. This solves the problem of sorting when rendering translucent objects such as leaves of trees.