Fixed root effect triggering on all damage

Added more custom knockback multiplier values

- Adjusted formula so all damage moves targets, but only high knockback values stun and launch into the air (stuns less often)
- Added several knockback scaling multipliers to certain abilities (DOTs are set to 0)
- Ranged heroes have a 0.8x knockback on attacks
- Illusions have a 0.5x knockback multiplier (stacks with ranged)

- Fixed some physics bugs
- Improved physics when a unit dies naturally

more small tweeks

slightly altered the launch stun formula

fixed maps

Created Dota 2 but it's also Super Smash Bros.