Feature Request: Add door color feature to distinguish doors of the same "Synchronization Group"

[p4535992]

Add the door color feature present in this module Door Color, the idea is to apply a specific color to doors of the same "Synchronization Group".

Additional: In addition, if possible, add the ability to show the GM one color and to players another (or none) so as not to make it clear that the doors are connected to each other.