Visual improvement - detailed soldier models

In this update the player models have been overhauled and changed in major ways.

Each player model now has a selection of visual improvements added to their character bodies. This includes various props like backpacks, gas masks, clothing, satchels, spades, etc. The textures on the models have also been redone.

This update doesn't add any game-play changes but adds a lot more visual quality to the experience with the added improvements.