Integrate useful enumerable extension methods

[abeham]

For HeuristicLab.Random:

• T SampleRandom<T>(IRandom random)
• IEnumerable<T> SampleRandom<T>(IRandom random, int count)
• IEnumerable<T> SampleRandomWithoutRepetition<T>(IRandom random, int count)
• IEnumerable<T> SampleProportional<T>(IRandom random, int count, IEnumerable<double> weights, bool windowing = true, bool inverseProportional = false)
• IEnumerable<T> SampleProportionalWithoutRepetition<T>(IRandom random, int count, Func<T, double> valueSelector, bool windowing = true, bool inverseProportional = false)
• IEnumerable<T> Shuffle<T>(IRandom random)

For HeuristicLab.Common:

• IEnumerable<T> MaxItems<T>(Func<T, IComparable> keySelector)
• IEnumerable<T> MinItems<T>(Func<T, IComparable> keySelector)
• T[,] Transpose() where T : default