Time for action – the GoalManager module

1. Add a new module called GoalManager to the Robot Rampage project.

2. Add declarations to the GoalManager module:

   #Region "Declarations"
   Private _computerTerminals As List(Of ComputerTerminal) = 
       New List(Of ComputerTerminal)()
   Private _activeCount As Integer = 0
   
   Private _minDistanceFromPlayer As Integer = 250
   
   Private _rand As Random = new Random()
   
   Private _texture As Texture2D
   Private _initialActiveFrame As Rectangle
   Private _initialDisabledFrame As Rectangle
   Private _activeFrameCount As Integer
   Private _disabledFrameCount As Integer
   #End Region

3. Add a read-only property to the GoalManager module:

   #Region "Properties"
   Public ReadOnly Property ActiveTerminals As Integer
       Get 
           Return _activeCount
       End Get
   End Property
   #End Region

4. Add the Initialize() method to the GoalManager module:

   #Region "Initialization"
   Public Sub Initialize(
       textureSheet As Texture2D,
       initialActiveRectangle As Rectangle,
       initialDisabledRectangle As Rectangle...