Fix how buildings are built

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The ring menu system is designed as such:

You left click on an object to select it. Then you right click on another
object to have the selected object perform a task on it. Upon the right
click, a ring menu opens so that you can select what it is that you want to do.

For example, you select one of your ships and you right click on an
opponent's ship + select board to attack it.

Building does not work this way at the moment. To build a shipyard, you
should select the ship you want to build it, right click on a bit of land,
and select "build shipyard". Then, when you've selected the action, the
ship should sail over there and build you your shipyard if it has the
resources to do so, and if it is (of course) possible for a ship to build
that far inland.

(The current way is to sail a ship over to some land, select the land,
right click the same land, and select "shipyard")

Note: in the future, when you have plots of land, there should be a
building (probably the town hall) that you select as the object that builds
things or bids on land. Possibly all buildings you own could have this
attribute as an alternative. I'll need to consider this in the design.

Original issue reported on code.google.com by gar...@gmail.com on 1 Nov 2008 at 5:05