Add theme options for users with visual impairment

Current Situation

• JOC Cockpit offers a number of themes with high contrast.
• Themes do not change the color of orders in the GUI as the color is meaningful.
• Some colors are hard to distinguish, for example waiting (yellow-green) and running (green).

Desired Behavior

• It should be posssible to specify color codes for order states within the scope of the user profile for use with any themes.