Tdesktop: [Feature Request] Sectional list, File preview, Share preview

[esajjad]

1. Sectional list:
   1.1 "Favorite section" (personal selection group or people)
   1.2 "Group section" with "Pin" ability
   1.3 "People section" with "Pin" ability
   
2. "File preview" same as "Forward preview"
   
3. "Share preview" in setting (Because data is not deletable and user may share unwanted data in public)
   

[auchri]

1. See #1107, looks better
2. and 3. I'll create a new issue for the 2 points

[Mateusresende]

And seriously, it places category, tag,
and it's hard to stay up all the time organizing the contact agenda.
You lose a lot of time, and we still forget people, because you get thrown back there.
And I have to write down the names on the wall.