Type Coercion helper to provide Coercion Function given a type

[MikeStall]

Have a helper that provides the appropriate coercion function for each type.
Ie, avoid people having to write this:

    // Coercion() 
    if (fieldType == FormulaType.String)
    {
        // No coercion needed 
    } else if (fieldType == FormulaType.Number)
    {
        sb.Append("Value");
    }
    else if (fieldType == FormulaType.Guid)
    {
        sb.Append("GUID");
    }
    else if (fieldType == FormulaType.DateTime)
    {
        sb.Append("DateTimeValue");
    }
    else if (fieldType == FormulaType.Date)
    {
        sb.Append("DateValue");
    }
    else if (fieldType == FormulaType.Boolean)
    {
        sb.Append("Boolean");
    }