Custom colors for thread markers like QKSMS

[SilverPuppy]

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Checklist

• [X] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [X] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [X] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [X] I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• [X] This issue contains only one feature request.
• [X] I have read and understood the contribution guidelines.
• [X] I optionally donated to support the Fossify mission.

Feature description

In the past I have used QKSMS, and liked the ability to assign colors to contacts such that I could usually tell who the sender was by the color of the notification on the lock screen, even though their name was (intentionally) hidden. I switched to this program because QKSMS is missing other important features, and is slow. If this program had that feature, there is nothing I'd miss about QKSMS (certainly not how slow it can be!)

Why do you want this feature?

It improves my ability to know the relative urgency of messaging contacts.

Additional information

No response