Persistent dirt

[FabianK3]

Summary

This PR adds persistent dirt.

Details

Persistent dirt (cleanable tiles) types can be found up to 7 days.
In that regard all types are equal except: Blood, fuel and floor damage will not be persistent in non-canon rounds (gamemode != extended or odyssey != canon) and instead turn into dirt.
The same areal restrictions for persistent dirt exist as for persistent trash (maints).

The following types are planned:

• confetti
• dirt
• ash
• flour
• molten item
• tomato smudge
• egg smudge
• pie smudge
• fruit smudge
• vomit
• blood (/ gibs)
• mucus
• liquid fuel (/ napalm)
• floor damage (engineering required)
• drafting chalk

Tasks

• Add new persistent type logic to documentation.

Thanks to @Arrow768 for starting with persistent dirt while I was still writing the subsystem and persistent trash.

[FabianK3]

!wip

[FabianK3]

Content scope freeze, testing.

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