From CHANGELOG.md:
Added
- Added continuous_damage_effect.
- invader-bludgeon: Added -T missing-bitmap-sequences.
Fixed
- Set maximum count of unit camera track references to 2.
- Made some flags read-only in model_animations.
- invader-bludgeon: Fixed missing-bitmap-sequences applying to sprites
- invader-build: Fixed some empty sequences being put in maps for sprites