Add support for pinned chats

[arcxne]

In Whatsapp, we have the ability to pin chats such that they appear at the top of all chats. It'd be nice to have this feature so that I can easily access my most important chats.

[d99kris]

Hi @arcxne - support for honoring pinned status in the chat list has been added in e8143b3.

May I check if this feature request was also for being able to pin/unpin chats from nchat?
If yes, I'll leave this request open. Thanks!

[arcxne]

I wouldn't really bother with pinning/unpinning chats in nchat itself, so no problem! Thanks for your time and effort!

[d99kris]

Although not requested in this feature request, I just wanted to mention that support for pinning / unpinning chats has been added now in v5.14.18 / 7ec3aa2.