Provide height blending to all shaders

[zwcloud]

Height blending shader has been implemented in MTE/Standard/4 Textures/Height Blend (Packed). We should implement height blend for all builtin shaders.

about height blend
http://untitledgam.es/2017/01/height-blending-shader/
https://zhuanlan.zhihu.com/p/26383778

Optionally, we can get normal from height.
https://www.leadwerks.com/community/topic/16244-calculate-normals-from-heightmap/?tab=comments#comment-106644
https://stackoverflow.com/questions/5281261/generating-a-normal-map-from-a-height-map
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.161.8979&rep=rep1&type=pdf
https://www.gamedev.net/forums/topic/594781-hlsl-height-map-to-normal-algorithm/

tool to convert normalmap to heightmap:
https://docs.substance3d.com/sddoc/normal-to-height-hq-159450594.html