Currently, to_chat is literally just a proc that does user << message.
But it'll let us do output modification in the future, especially for
something like Goon's HTML chat.
Big thanks to PJB for his to_chat script, see
https://github.com/d3athrow/vgstation13/pull/6625 for more details.
- Flesh to Stone and Disintegrate are now actual touch attacks.
- Fixes issue with in-hands and back sprites missing for the staff of
animation.
- Fixes missing right-handed in-hand for the staff of healing.