Shiny new functionality! Low Ammo notifications, sounds and looping effects!

1. Add more weapon maxxed sounds to complement the revolver spin sound for other weapons.
2. Add message to let player know that they have just loaded the last of their ammo.
3. Add new looping sound effect functionality for held items, such as the lantern (audio cue so player know its on), and unique sounds for all explosive activations and throwing.
4. Improve the "will soon explode" descriptions for the molotov.
5. Make sure all loop and ambient sounds are terminated when returning to the main menu