Some improvements from `more-streams` (#4510)

packages/rocketchat-action-links/server/actionLinkHandler.js

packages/rocketchat-api/server/routes.coffee

...hannel-settings/client/startup/trackSettingsChange.coffee

packages/rocketchat-highlight-words/client.coffee

packages/rocketchat-highlight/highlight.coffee

...s/rocketchat-integrations/server/processWebhookMessage.js

packages/rocketchat-katex/katex.coffee

packages/rocketchat-lib/README.md

packages/rocketchat-lib/client/MessageAction.coffee

packages/rocketchat-lib/lib/settings.coffee

packages/rocketchat-lib/server/methods/filterATAllTag.js

packages/rocketchat-lib/server/methods/filterBadWords.js

.../rocketchat-lib/server/methods/joinDefaultChannels.coffee

packages/rocketchat-lib/server/models/Messages.coffee

packages/rocketchat-lib/server/models/Rooms.coffee

packages/rocketchat-lib/server/models/Subscriptions.coffee

...ocketchat-livechat/client/views/app/tabbar/visitorInfo.js

packages/rocketchat-livechat/server/hooks/offlineMessage.js

packages/rocketchat-livechat/server/hooks/sendToCRM.js

packages/rocketchat-livechat/server/startup.js