Icebox Edge Wall uses adjecent turf's propeties, does not mix well with ice sheets

[MonkestationIssueBot]

Reporting client info: Client Information:
BYOND:515.1640
Key:hukwastaken

Round ID:

6170

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Reproduction:

The edge of Icebox's map, I.E, the black walls going into nothing, use the propeties of the Turf next to them, if said turf is a Sheet of Ice, and you slip on it towards the wall, you will be stunned for eternity, being unable to move entirely, even teleportation, or other methods of breaking out of stuns do not work. No-slips also do not provide protection to slipping on ice-sheets, despite the name. (Please change the propeties of the Edge wall, and allow no-slips to bypass icesheet's slips.)