Weekly routine update 1：NSR28 shotgun，Urea tool，A test scene

The first weekly routine update of E.E.R.I.E 2 includes:
1. NSR28 shotgun: The manual shotgun designed and produced by Kappa uses magazine feed. After shooting, you need to press the shooting button again to manually load it. It is equipped with two kinds of ammunition: slug and buckshot.
2. Urea tool: you can look around freely in the scene, generate objects, and load other map in it, Can be opened through the button in the main menu.
3. Test scene: a simple urban environment test scene, which can only be accessed through the urea tool.
Other notes: E.E.R.I.E 2 will be updated once a week before it is completed (it may stop for two weeks during Chinese New Year), and the update date of each week is uncertain.This update will overwrite the previous settings, and the next update will not overwrite them.