Levles (well, somewhat)

So, after the layoff after pyweek stretched a bit longer than originally planned, we've started to work on Fox Assault again.
There have been a few tweaks to game balance and some significant reworking of the codebase to eliminate some of the more glaring awkward bits of it, which all seems like a good time to start destabilising things by adding new features.
So, as of last night, Fox Assault supports basic levels. A large number of parameters are now configurable, although more need to be converted to be defined by the level, and, obviously, different maps for a level are supported. Levels currently need to be specified obn the command line - a nice level loading screen is still in the pipeline, but propbably won'te be finished until closer to the deadline.