New Features and Improvements
- Add "Fast Line-of-Sight Calculation" option, a faster blockmap-based algorithm from Doom 1.2 (also Heretic).
- Add "Invulnerability Effect" option to override the MBF "sky fix", and provide a "Gray" colormap that is easier on the eyes.
Bug Fixes
- Apply deadzone to gamepad for strict mode check.
- Prevent turning on first tic of an SR50.
- Render linedef texture instead of sky if flat is missing.
- Make light levels independent of screen size.
- Fix menu tab centering.