* Add config value EnableXToLeaveChannelsFromLHS that if true displays x to the right of private and public channels on the LHS.
* Displays x to the right of private and public channels on the LHS based on if EnableXToLeaveChannelsFromLHS=true.
* change the tooltip for private and public channels to `Leave channel`
* Add client-side event for when user clicks the "x" button. Different for public, private, DM.
* Removed restriction that prevented last occupant of a channel from leaving. Any user can now leave any channel, except for the default Town Square channel
* Also removed last user leave limitation from navbar
* Removed permalink from system messages, general cleanup
* Removed permalink from deleted messages
* Removed permalink from pending messages
* Fixed post_info tests
* Changed permalink logic to remove permalinks from ephemeral messages, but leave them in place for system messages.
* Fixed check style
In this change, user action for toggling the preview is stored in the browser localstorage. Hence If there us a preview visibility value is present
in the localstorage, that will be given the preference compared to the overall preview setting.
* Add config values for client versions. Return client versions in ping response.
* Manage client version through System Console.
* Added client versions to diagnostics
* Added translations messages en.json file.
* Hide Client Versions on System Console.
* Fixed LHS Team Sidebar on hover highlight.
* Fixed LHS Main Menu on hover tooltip to show "Main menu".
* Added On-hover highlight for Favorite button in channel heading.
* Added active state for channel members icon.
* Added active class based on internal react state with new changeCss rule.
* Changed cursor to pointer on hovering a theme.
* Fixed Invite New Member Add Button to have text-underline on hover.
* open up a shortcuts dialog instead of printing help text
* Updating UI for keyboard shortcuts modal
* update PR per PLT-7284
* fix typo error
* fix mixed up shortcut keys
* move to client side
* fix shortcuts list, remove unused function and revert server side code for autocompletion
* remove quick team switcher
* PLT-7206: UI changes. Removed last user in channel loophole, refactored code to clean it up, added differentiated support for public and private channels, added unit tests. Still need to implement server-side checks
* PLT-7206: All helper methods in channel_utils.jsx now accept the same three boolean variables in the same order and use the same boolean logic to check their values.
* PLT-7206: Added unit tests for showManagementOptions(...)
* PLT-7206: Fixed test case descriptions
* Added unit tests for showCreateOption(...)
* PLT-7206: Added unit tests for canManageMembers(...)
* PLT-7206: Removed last person in channel loophole from server-side code
* PLT-7206: Reverted config.json
* PLT-7206: Fixed double negatives in unit test names
* PLT-7206: PR feedback - Removed confusing comment and unused variable
