Adjusts weight of bird and bug corpses.

I could have rolled this in with my last PR if I'd thought of it at the
time; hindsight being 20/20 and all that.
Restores missing hazmat_eyes item group.
Merge pull request #7014 from Rivet-the-Zombie/other-species-weight-fix

Adjusts weight of bird and bug corpses.
Merge pull request #7015 from TranquilMarmot/nonefix

Fix 'You holster your none.' message
Merge pull request #7018 from Rivet-the-Zombie/mask-silliness-fix

Restores missing hazmat_eyes item group.
Merge branch 'master' of https://github.com/CleverRaven/Cataclysm-DDA into cigaweed
Added smokable joints
Tweak pot smoke field
Cigarettes now get affected by tolerance and lightweight traits