[Feature] Better multitool/wirecutter interaction with vendors

[saccharineChampion]

Currently, if you hit a vendor with wirecutters, even if the panel is open, it hits the machine - potentially tipping it.
In addition, the seed fabricator plays similarly not-nice with multitools.
This patch fixes those interactions; now it operates identically to airlocks in that regard.
https://github.com/goonstation/goonstation-2020/pull/87