[NEW] Ignore user on channels (#10517)

packages/rocketchat-api/server/v1/chat.js

packages/rocketchat-i18n/i18n/en.i18n.json

packages/rocketchat-lib/client/MessageAction.js

...s/rocketchat-lib/server/lib/sendNotificationsOnMessage.js

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

...s/rocketchat-theme/client/imports/components/messages.css

...ages/rocketchat-theme/client/imports/general/base_old.css

packages/rocketchat-ui-flextab/client/tabs/membersList.html

packages/rocketchat-ui-flextab/client/tabs/membersList.js

packages/rocketchat-ui-flextab/client/tabs/userActions.js

packages/rocketchat-ui-master/public/icons.svg

packages/rocketchat-ui-message/client/message.html

packages/rocketchat-ui-message/client/message.js

packages/rocketchat-ui/client/lib/RoomHistoryManager.js

packages/rocketchat-ui/client/lib/RoomManager.js

packages/rocketchat-ui/client/views/app/room.js

server/methods/ignoreUser.js

server/publications/subscription.js