BUR #6515 has been approved by @evazion.
create implication super_robot -> mecha
create implication walker -> mecha
create implication externally_piloted_mecha -> mecha
Implicating subsets of mecha to the main tag. I excluded exoskeleton and power armor since those are often worn rather than piloted, and many of the posts under those tags wouldn't be appropriate under mecha for tagging purposes.