modified GUI elements

ammo counter may not work after upcoming changes to weapon scripts from CinnamonBagels, but I will fix the GUI elements when I need to. I think I'll have to change where I am getting the ammo values from the weapon script itself to Weapon_Stats.cs (see https://github.com/CinnamonBagels/project-eva/blob/develop/Assets/Scripts/Weapons/Weapon_Stats.cs), but that should be easy enough.