Dots instancing compatible Graphics Tools shaders #204

Describe the problem

When using Entities Graphics, the Standard shader can't be used as it isn't dots instancing compatible.

Describe the solution you'd like

Make the shaders in graphics tools Dots instancing compatible.
https://docs.unity3d.com/Packages/com.unity.entities.graphics@1.0/manual/dots-instancing-shader.html

Describe alternatives you've considered

Use a different shader.

Additional context