Imply Turretless Tank -> Tank

BUR #37025 has been approved by @evazion.

create implication turretless_tank -> tank

It is a type of tank.

The bulk update request #37025 (forum #336451) has been approved by @evazion.

As last discussed in topic #10302, turretless tank, tank destroyer, assault gun, and self-propelled artillery seem to have a lot of overlap, with turretless tank being the most visually well defined.

There are also a handful of turretless spider tanks / walker tanks like post #3363205 and post #4446945. These start to blur the line of what is considered a tank.