Add HEX color support for event segments

[marciogurka]

Forum post

Currently, the event segment feature allows the user to use only color names, would be nice to accept also HEX colors support for that feature.

Example:

eventsData : [
            {
                id        : 2,
                name      : 'DIY project',
                startDate : '2022-03-21',
                segments  : [
                    // segments can have their own names & colors
                    { name : 'Plan', startDate : '2022-03-21', duration : 1, eventColor : '#000000' }, // like this
                    { name : 'Get supplies', startDate : '2022-03-23', duration : 2  }
                ]
            }
        ]