Randomising missions

[Octocat]

More concise and economical way to generate random numbers:

internal ISectionFile RandomiseMission()
{
    var random = new Random(Environment.TickCount);

    ...
    value = random.Next(minBreezeActivity, maxBreezeActivity).ToString();

    ...
    value = random.Next(minThermalActivity, maxThermalActivity).ToString();

    ...
}