Silo entryway message repeats

[NQNStudios]

In the southeast of Sweetgrove there is a silo full of rats whose entrance tile displays a descriptive message. You'll open the door and see the message, probably go into combat, and move each of your PCs into the silo and every one of them will get the descriptive message again. It needs to turn off after the first time.

I'm wondering if this node used to be a 'Room description' node? If it did and that feature isn't converting properly then #712 is a related issue.

Otherwise, we should manually edit it so it only shows once, and PR that onto scen_update.

[NQNStudios]

I checked the legacy file in the legacy editor and found it has always been a plain Display Message node. So it needs to be changed manually

[NQNStudios]

Aw, jeez. How am I gonna pick an SDF for this dialog? I have no idea which ones are already used in VoDT/Sweetgrove.

Maybe we should pick a row (first coordinate) for any SDFs we might add to a built-in scenario. One that's really unlikely to have been used if JV followed the numbering conventions he recommended in the docs.

[CelticMinstrel]

The fool-proof method would be to pick an SDF from a row that didn't exist in legacy BoE.