The chevron sometime can be confused as an icon for expanding the
stream topics especially for the new users.
This commit replaces the confusing chevron icon from the stream-sidebar,
topic-list, user-presence-row, all-messages and starred-messages with
ellipsis-v icon(vertical three dots).
Fixes: #7115
Hovering over user names (and user circles for PM List) now displays
Name, Status Message and Last online time in a js tooltip.
Hovering over group names displays the names of all group members.
Unavailable users are shown as "Last active: Today".
Hovering on a user circle in the Buddy List results in a js tooltip
with Active/Idle/Offline/Unavailable for
green/orange/white/white-with-line.
Resolves#11607.
SiddharthVarshney
Vinit Singh
Anders Kaseorg