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.
This commit does the following:
- Ports progress bars from -tg- (tgstation/-tg-station#9921)
- Refactors wall attackby code to make it 100% less insane; Instead of
manually checking every little thing, it uses do_after,
consequentially, making the new progress bars affect dealing with walls
as well.
Wall code makes a tiger sad.
