Broken-bot audit

Looks like all broken bots were manhacks.  This starts bringing volume
and mass in line with their size, gear, etc.
Merge branch 'master' of https://github.com/CleverRaven/Cataclysm-DDA into botcheck
Through tripods

These are based on the weight of heavy things (steel chunks, scrap,
motors, etc) in the disassembly.
All weights/volume recalibrated

Same logic as with the earlier pass.
Damage rebalance

Because if you can pick up a tribot or tankbot, you ought to do some
damage swinging it around.
Merge pull request #8453 from KA101/botcheck

Broken-bot audit