Change message list to material 3 part 1

[wmontwe]

This removes customizations that don't work well with Material 3.

[cketti]

I can see that we need to change the approach to properly support this functionality with Material 3. Removing the functionality now and adding it back using a new approach later runs the risk of simply forgetting about it. That's why I'd much prefer a pull request that replaces the mechanism, not remove it.

I think having different text colors for read and unread messages is an important part of the user experience. Especially in dark mode.

Before	After

[cketti]

From a technical point of view the patch looks good to me.

However, I think it's a UX regression that should be fixed as soon as possible if this is merged as is.

[wmontwe]

The UX will have some regressions as there is no direct replacement for all the customization done in the existing theme.

There are also a couple of XML layouts that either don't use Material components or are even applying AppCompat styles still. Will take some time to remove all of that to get a clear view on all the little things that are not working.