Basic parsing and storage of Hexen MAPINFO data.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2881 86ba831e-150c-0410-ab35-e06eaae15ed9
* Propagation of info from MAPINFO to global LevelInfo structure
* Support for global FOGMAP lump in colormap lookup functions, for Hexen's benefit
* Some refactoring of intermission level name handling (more work needed)

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2882 86ba831e-150c-0410-ab35-e06eaae15ed9
* Support for separate finale data for secret exits versus normal exits
* finale-early flag controls whether finale happens before an intermission

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2883 86ba831e-150c-0410-ab35-e06eaae15ed9
Rewrote Hexen MAPINFO parser to store data in metatables.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2884 86ba831e-150c-0410-ab35-e06eaae15ed9