[PATCH] siege tower should be able to capture structures

[mimo]

It would be nice to make the siege towers able to capture structures. That would give them a role more in line with what they were used in reality.

[mimo]

In 16907:

make siege tower able to capture, fixes #3356

[Niek]

Siege towers should IMO be able to capture walls only but no other buildings (maybe Fortress too). I think that gives them a distinct role that represents reality better (since no other units are able to capture walls).

[mimo]

They should also be able to capture fortresses and towers. But I don't think it is worth to make this kind of distinctions now, because we need first to settle which structures should be capturable or not, and how to deal with non-capturable structures (should they health decay or something else ?). But I guess that will be A20 program.

[fatherbushido]

In 18766:

Reverts r16907 as capture doesn't work for units with BuildingAI. Refs #3356, #4189, #4000.

[fatherbushido]

in fact it was broken in r17784

[elexis]

Backlogging due to lack of progress

[Imarok]

Move tickets to Simulation as UI & Simulation got some sub components.

[Freagarach]

​https://code.wildfiregames.com/D1819