Added a set of new terminal models.
The models have been imported and fully prepared with the Model Editor, complete with GUI fixtures, proper scaling (relative to a player model), etc. These terminal models are supposed to replace the older "television" and "LCD-panel" models that still use the now obsolete struct GuiLocT for specifying their GUI plane.
The metal texture has been derived from a desaturated and brightness-adjusted copy of Games/DeathMatch/Textures/TechDemo/trims/strim_diff.png that has also been adjusted for seamless tiling.
References #78.
