upgrade jquery to v3 and implement photoswipe

package.json

packages/rocketchat-markdown/markdown.coffee

...ketchat-message-attachments/client/messageAttachment.html

packages/rocketchat-oembed/client/oembedImageWidget.html

packages/rocketchat-theme/client/imports/base.less

packages/rocketchat-theme/client/imports/rtl.less

packages/rocketchat-theme/client/vendor/photoswipe.less

packages/rocketchat-theme/package.js

packages/rocketchat-ui-admin/admin/admin.coffee

packages/rocketchat-ui-master/master/main.coffee

packages/rocketchat-ui-master/master/main.html

packages/rocketchat-ui/lib/jquery.swipebox.init.js

packages/rocketchat-ui/lib/jquery.swipebox.min.css

packages/rocketchat-ui/lib/jquery.swipebox.min.js

packages/rocketchat-ui/package.js

packages/rocketchat-ui/views/app/photoswipe.html

packages/rocketchat-ui/views/app/photoswipe.js

public/images/default-skin.svg

public/img/icons.png

public/img/icons.svg