[bulk] snow_shelter implications

create implication igloo -> snow_shelter
create implication quinzhee -> snow_shelter

Link to request

Specific snow shelter tags to general snow shelter catchall tag.

Igloo: Constructed from blocks of compacted snow.
Quinzhee: Constructed by hollowing out a mound of snow.

+1

+1, just because this this tag is easier than searching for ~igloo ~quinzhee.

The bulk update request #591 has been approved.