Zeno Clash

Here are the new features / fixes:

- New feature: The player can throw the weapon with the 'block' key
- Added a manual lock-on option in the main menu
- Fixed grab items / autolock conflict (enemies can't be targeted when looking down)
- Player can now unlock by running backwards
- Balanced difficulty level of Tower challenges
- Final boss battle has a health fruit (slightly easier)
- Boss characters can grab the player when he is unlocked
- Fixed infinite kick exploit
- Fixed heavy opponents pains issue