- use strings for fg_root and airport_id and added methods to return
them as strings,
- inlined all access methods,
- made the parsing functions private methods,
- deleted some unused functions.
- propogated some of these changes out a bit further.
- saving the entire vertex list for each tile with the tile records.
- saving the face list for each fragment with the fragment records.
- code to intersect the current vertical line with the proper face in
an efficient manner as possible.
Fixed a bug where the tiles weren't being shifted to "near" (0,0,0)
Working on rewriting the tile management system so a tile is just a list
fragments, and the fragment record contains the display list for that fragment.
data file rather than calculating it on the fly.
Fixed polygon winding problem in scenery generation stage rather than
compensating for it on the fly.
Made a fgTILECACHE class.
