If I had a hammer...

Lots of furtling under the bonnet today, tidying up the poly-picking for buildings and adding the functionality to the allow players to build things (if they can afford it).
The plan is that players can build buildings and these will gradually generate resources. The resources are collected (or stolen!) by the player who commands the unit which is closest to the building, so players will need to post guards near buildings unless they want it to get robbed.