Improved basic thread system

Reformatted parts
Updated markup and general css style.

Threads view is still not 100% good.
Polished layout and design even further.

Threads still overlapping. Fixing in the future.
Fixed thread overlapping on small screen sizes.
Online users logic
Minor fixes
Added last timestamp gaining more opacity
Minor layout and code fixes
Implemented online users, needs styling. Users per threads need to be displayed
merged