hatching implication

BUR #3895 has been approved by @evazion.

create alias line_shading -> linear_hatching
create implication linear_hatching -> hatching_(texture)
create implication crosshatching -> hatching_(texture)

currently crosshatching does not implicate hatching.
Linear hatching is the formal name for line shading.

EDIT: The bulk update request #3895 (forum #175710) has been approved by @evazion.

I think an alias would be better than a rename in this case.

Changed to an alias.

The bulk update request #3895 (forum #175710) has been approved by @evazion.