Add Color Picker Parameter Type

Hello,

Please add the support for color type parameters on indicators and cBots, so will be able to have a parameter like this:

using cAlgo.API;
using cAlgo.API.Internals;
using cAlgo.API.Indicators;
using cAlgo.Indicators;

namespace cAlgo
{
    [Indicator(IsOverlay = false, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class Blank : Indicator
    {
        [Parameter("Text Color", DefaultValue = "#FF5733")]
        public Color TextColor { get; set; }
        
        protected override void Initialize()
        {         
        }

        public override void Calculate(int index)
        {

        }
    }
}

We should be able to use HEX color values for default value and the user will see a default cTrader color picker on "Modify Indicator" windows with the default value as selected color.

This will make our life much easier!