"archive" consistency and improvements (#3918)

* move 'archived link' betweeen pinned and normal cahts or above normal chats

* add icon for 'archived chats' link

* let get_fresh_msg_cnt() work for DC_CHAT_ID_ARCHIVED_LINK

* move 'archived link' topmost

* use less noticeable archived-icon

* slightly smaller archived icon

* update CHANGELOG

assets/icon-archive.svg

@@ -0,0 +1,60 @@
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