Some tweaking and code smoothing of the spray-on gloves. The only
mechanical change is in also letting them be washed off (although it
takes a while under a shower or using a sink).
A visible message also provides better feedback.
* Make /wash a SHOULD_CALL_PARENT proc
A number of things depend on that signal being called.
* Makes suggested changes
- Adds SIGNAL_HANDLER to signal handler
- Changes name of turf variable for readability
- Reenables lighting object override of parent
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