better or custom colors

[MichelR-be]

The color (output) markings are looking to much alike.
So maybe:

• add a thin gray line in TEST STRING, to show lines in 1 match instead of alternating the color =free up more colors
• allow custom colors for groups or make = for those that are a bit colorblind or have bad monitor-settings
• if some text belong to 2 groups divide the background in 2 to 4 colors

Also maybe allow more and further sliding of the different frames and even move one to the 2nd monitor ;)

Thanks