Accept resources trait for a player

[forcecore]

Needed for a proper MARV.
Current implementation of mods.common has potential bugs...
Whenever any harv virtually dockes in a PROC then it "evicts" from dockedHarv pointer.
When enemy engineer comes and captures the building then the virtual docked one will get captured.
Not good.

[GraionDilach]

There's also abcdefg30/OpenRA.Mods.AS@81a86e2 which never was PRed but I think I'll take it over to get it sorta finished.

[forcecore]

Oooh looks good :)

[GraionDilach]

Yeah, I remember my main pick with it back then was that it lacks the deploy functionality to start processing anytime, but it's been a while.

[forcecore]

Keeping track of "virtually docked" harvesters instead.
Conceptually, chrono harvs need at least 1 alive refinery in my mod.

forcecore/OpenRA@ef13feb