Make fluid canisters mechcomp compatible.

[deathrobotpunch]

Now this one's tentative cause I'm not sure if the fluid canisters being movable objects makes this impossible or not, but I think allowing for mechcomp to toggle between the off, in and out states of fluid canisters would make for a lot of funny contraptions.

They recently added claw arms that are able to move all obj items including fluid cans.