[#383] ListDialog custom value

[LDami]

The ListDialog can be used like this:

ListDialog<BasePlayer> listDialog = new ListDialog<BasePlayer>("Players", "Select", "Close");
listDialog.AddItems(BasePlayer.All);
listDialog.Response += (object sender, SampSharp.GameMode.Events.DialogResponseEventArgs<BasePlayer> e) =>
{
    player.SendClientMessage($"Dialog closed, selected player is \"{e.ListItem.Name}\"");
};
listDialog.Show(player);

[ikkentim]

I've merged and refactored this in 1d74c22 .

• It's generally not a good idea to rely on reflection when there other ways to to the same thing without reflection (getting the name of colors)
• Because the implementation of ListDialog conficts with the goals of ListDialog<T>, I made it inherit directly from Dialog.
• I've removed changes which change the existing behavior/are opinionated changes (ToString implementations of BasePlayer/BaseVehicle)
• Added a ShowAsync implementation to ListDialog<T>
• Some minor other changes