* Added drawshader to draw Heretic style transparency gradients.
* Added artiflash flag to drawselectedinventory.
* Fixed: Drawgem used the wrong operator when determining the chain size.
* Fixed: ZDoom would crash if an undefined font was used.
* I also started cleaning up the source a little. I have been informed that
when checking for flags the "== flagname" is redundant.
- Added indexfont anf hudfont from GZDoom to zdoom.pk3 so that they are always
available when defining custom status bars.
SVN r629 (trunk)
