richcontent support in polls, user cards and user profiles

src/components/basic_user_card/basic_user_card.js

src/components/basic_user_card/basic_user_card.vue

src/components/notification/notification.js

src/components/notification/notification.scss

src/components/notification/notification.vue

src/components/notifications/notifications.scss

src/components/poll/poll.vue

src/components/rich_content/rich_content.scss

src/components/status_content/status_content.vue

src/components/user_card/user_card.js

src/components/user_card/user_card.vue

src/components/user_profile/user_profile.js

src/components/user_profile/user_profile.vue

src/services/entity_normalizer/entity_normalizer.service.js