Use bootstraps list-group to show messages
I mainly reworked it to make the whole divs clickable. I think they look better that way and using pure bootstrap would also cut down on additional css
- Make the whole div clickable
- include summary_thread directly in overview (using include costs time)
The functionality and display should be more or less the same. I did hide the counter, because I think it looks cleaner I opted to use bootstraps label instead of a custom one. bootstrap v3 does not support custom backgrounds, but bootstrap 4 will. Until then they just are the default ones.