Pre-alpha 3

Changelog:

-Upgraded unity version from 2021.3.4f1 to 2021.3.36f1.

-Added med-kits.

-Added Bear-traps

-Added pickups.

-Improved graphics a bit.

-Improved performance  a bit.

-Your first person arms are no longer stiff.

-Added the shed.

-Added some small wood towers around the map.

-Added main menu music.