Update 1.2 - New rats, ingame shop and customs

New rats:

1. Rat that can dodge first bullet.

2. Rat that you can shoot to slowdown other rats.

3. Rat with a bucket on its head. The bucket protects it from first bullet, but also limits its movement.

Shop, achievements and new main menu:

Added 5 new achievements. Every achievement will give you some points to spend in the shop in the main menu. You can buy maps, characters and lootboxes with clothes in it. 

You can't buy lootbox if you have every item from it, and it won't give you item that you already have.

Main menu has been reworked to allow this changes. 

Custom game:

This gamemode will allow you to change almost every imgame variable, for example rats speed or spawn chance. You can't get any achievements or other rewards in this gamemode.