finish image sharing between templates

frontend/src/components/reload/AutoReloadCheckbox.vue

frontend/src/utils.js

frontend/src/views/basic_photo_banner/BasicPhotoBanner.vue

frontend/src/views/basic_photo_banner/canvas.js

frontend/src/views/facebook_survey/FacebookSurvey.vue

frontend/src/views/facebook_survey/canvas.js

...src/views/newspaper_quote_bottom/NewspaperQuoteBottom.vue

frontend/src/views/newspaper_quote_bottom/canvas.js

...src/views/newspaper_quote_middle/NewspaperQuoteMiddle.vue

frontend/src/views/text_banner/TextBanner.vue

frontend/src/views/twitter_banner/TwitterBanner.vue

...iews/urgent_basic_photo_banner/UrgentBasicPhotoBanner.vue

frontend/src/views/urgent_text_banner/UrgentTextBanner.vue