Hotfix 0.21

HotFix 0.21:

- Increased drop chance of rare caches by 20%

- Increased drop chance of legendary caches by 15%

- Increased drop chance of mythic caches by 300%.

- Fixed a pile of leaves near the entrance of the main area that had the wrong collision profile set. Causing zombies to become stuck there.

- Fixed the weapon "Mac 10" from not using its sound files when fireing.

- Updated inventory ui to display correct game version.

- Fixed an issue causing ammo boxes to not display "not enough cash" popup if the player had a reforged mythic weapon.

- Lowered base soundtrack volume by 10%.