Added a setting to the bottom of Settings > Display settings > Theme section
to display the reacting users on a message when numnber of reactions are
small.
This is a preparatory commit for #20980.
Add `escape_navigates_to_default_view` as a bool setting in
UserBaseSettings model and implement it as a checkbox that toggles
the hotkey implementation of escape to the default view in the
advanced user display settings.
With /help/ documentation edits from Alya Abbott.
Fixes#20043.
Anders Kaseorg
Raghav Luthra
Lauryn Menard
Sahil Batra