Fixed bugs. Added a hotkey. Optimized the game.

1. Inventory errors were fixed in the game (there were problems with guns, when they were moved from quick access to the satchel - cartridges were added), this error appeared after the last update. 2. Now the game has a hot key for opening and closing of the container. To do this, press the "TAB"key. 3. The game was further optimized by removing duplicate materials. This optimization reduces the load on the video core.