allow change of Theme color from the "newpipe red"

[X] I made sure that there are no existing issues - open or closed - which I could contribute my information to.
[X] I have read the FAQ and my problem isn't listed.
[X] I'm aware that this is a request for Tubular itself and that requests for adding a new service need to be made in vanilla NewPipeExtractor.
[X] I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
[X] This issue contains only one feature request.
[X] I have read and understood the vanilla NewPipe contribution guidelines.

Color wheel option to change the app Theme color replacing the "newpipe red". brownie points if gradient is allowed.

after years of using the app, the "newpipe red" color is getting tiresome and it is soo prominent it makes the app feel dated.

identity and brand separation from Newpipe project

a menu like this:

polymorphicshade / Tubular