Add HDRP/LWRP support

[AndrewRH]

Currently the ApplyToMaterial/ApplyToMesh scripts don't work correctly. This is due to materina.mainTexture not working with HDRP, so it needs to be changed eg:

				//_material.mainTexture = texture;
				_material.SetTexture("_BaseColorMap", texture);

Have to see if anything else needs changing too.

[rilez]

Hey @AndrewRH thanks for this! Saved me a lot of time having to dig around and find where this was done. Would be great to see this rolled into the main product!