Update 0.0.4

Version 0.0.4

Additions:
+ Overhauled the weapon system
+ Added weapon switching
+ Added a new erase all data button to the settings
+ Added a small light to grappling hook impacts
+ Added an FOV slider to the settings
+ Main menu has been fully overhauled
+ Main menu now has music
+ Added a startup screen

Changes:
* Fixed a bug where grappling hooks opened doors
* Changed the weapon viewmodel to be more in the centre of the screen
* Fixed a bug where a target received its own health as damage, instead of the damage value