Add sound when blocks affected
Update Hero's Bow to BG2 1.0.6.1 compatibility
Added Back Slice

- Added new skill: Back Slice
- Added IEntityBackslice for vulnerable / immune entities
- Updated KeyInputEvent handling for Forge 1217+
- Updated skills gui for extra skill
Added some quests and achievements

- Added Knight's Crests
- Added Orca the skill trainer
- Added Orca quest line + Achievements
- Added Scarecrow's Song quest line + Achievements
- Reorganized achievement positioning
- Removed Super Spin Attack fairy acquisition method and related
achievement