Match material property size with Unity's defaults

[forestrf]

I wanted the material gui to render the labels, controls and everything the same way the default one does. Searching around with ILSpy to see how they do it I found that, fortunately, it was done with a single line.

This is how it looks before and after the change:

Before	After

[forestrf]

I added another commit to add more default stuff from Unity:

if (UnityEngine.Rendering.SupportedRenderingFeatures.active.editableMaterialRenderQueue) {
    materialEditor.RenderQueueField();
}
materialEditor.EnableInstancingField();
materialEditor.DoubleSidedGIField();