## About The Pull Request
This has the potential to create a lot of needless mob updates which is
not great. Now should only update a mob's clothing if it was actually
washed.
This PR
1) ensures that all wash() procs return a bitflag.
2) ensures that `wash()` proccalls which result in expensive operations
like icon updates only do so when it is necessary
## Why It's Good For The Game
Updating mob sprites is expensive, and doing it when nothing has been
changed is bad.
## Changelog
Nothing really player facing
2bae025bfe