Tests shoving (as well as the knock down and dropping your item), harming (both with and without an item), and the attack chain.
I can think of a few cases in very recent memory that these have been broken (devil removal breaking melee damage, attack chain breaking due to something else).
Also adds `TRAIT_PERFECT_ATTACKER` which makes your punches always hit. This is currently only used for tests, as they are meant to be reliable.
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