Ability to use custom DirectionalShadowLight into CascadeShadowMap

[dar-dev]

We miss the possibility to create a custom DirectionalShadowLight when creating lights for cascading into CascadeShadowMap class.

gdx-gltf/gltf/src/net/mgsx/gltf/scene3d/scene/CascadeShadowMap.java

Line 60 in ccfc8af

lights.set(i, new DirectionalShadowLight(w,h));

gdx-gltf/gltf/src/net/mgsx/gltf/scene3d/scene/CascadeShadowMap.java

Line 63 in ccfc8af

lights.add(new DirectionalShadowLight(w,h));

This is a quick implementation:

protected DirectionalShadowLight createDirectionalShadowLight(int shadowMapWidth, int shadowMapHeight)
{
 return new DirectionalShadowLight(shadowMapWidth, shadowMapHeight);
}