Merge pull request #4343 from RocketChat/improvements/popup-without-subscriptions

...s/rocketchat-ui-message/message/popup/messagePopup.coffee

...ketchat-ui-message/message/popup/messagePopupChannel.html

...ocketchat-ui-message/message/popup/messagePopupChannel.js

...etchat-ui-message/message/popup/messagePopupConfig.coffee

...cketchat-ui-message/message/popup/messagePopupConfig.html

packages/rocketchat-ui-message/package.js

packages/rocketchat-ui/views/app/spotlight/spotlight.coffee

server/publications/channelAutocomplete.coffee

server/publications/filteredUsers.coffee

server/publications/spotlight.coffee