[Feature request] Expose username as HTML attribute
**Is your feature request related to a problem? Please describe.**
Excluding spam or toxic accounts from Twitter searches makes life much easier. I also want to highlight important accounts and not miss them from hundreds of tweets. 

**Describe the solution you'd like**
Changing from `<div class="timeline-item ">` to `<div class="timeline-item" data-username="johndoe">` makes it easier to create user styles. 

**Describe alternatives you've considered**
-  Adding `-from:johndoe` as search term. (Cons: Can only be used for exclusions. The more users you exclude, the harder it is to manage. )
- Use uBlock Origin's advanced filters. (Cons: A little slow and uBO does not work on all environment)
