UFO:Alien Invasion Code

* removed glcmds from md2 files (to reduce the filesize)

* updated ufoyard model with the replacement model by Willem Sitters (gpl 2 or later)

* add dummy model for ufoyard (linking it to defence model affected 2D geo either which we don't want)

* use the trunk base content

* delete the base to allow to copy the trunk one

* added base attack skin to base.md2 (geoscape model)

* fixed wrong texture linked to model

* changed model of base on 3D geoscape
* made model smaller on 2D and 3D maps
* fixed wrong angle of idle models on 3D maps
* using space on 3D map also change zoom, now

* reexported base and mission models

* Added (templates for) base and generic mission icons.