Constructor
new BuyWeapons()
    Constructor for the Buy Weapons Mode
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Methods
draw()
    draw the buy weapons mode
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drawTitle()
    Draw title
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drawWeaponButtons()
    Draw the weapon buttons
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setupWeaponButtons()
    Setup the weapon buying buttons
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shutdown()
    Shutdown the weapons buying mode and reset the tanks for game play
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startup()
    Startup actions that require access to the game engine
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update(dt)
    Update the buy weapons mode
    Parameters:
| Name | Type | Description | 
|---|---|---|
| dt | number | The time between the current frame and the previous frame. | 
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