* Add custom fields to livechat

* New livechat embed code with onload callbacks

* Add livechat custom field example to live chat demo

* Add custom fields in Livechat Administration;

* Fix for eslint

* rename variable $RocketChat to just RocketChat

* Only list users and bots for direct messages

* New field to track livechat agent availability

* Fix survey UI issues

* Fix for Codacy

* New field 'type' for users

* Show only default room types on Admin > Rooms

* Rename migration 40 to 41

* fix spell & format

* update russian i18n

* fix russain spell

When no password is set (logged in via oauth), don't ask for password
when saving profile and ask for username when deleting account.

Not sure if this was annoying anyone else, but I figured I might as
well try to help out where I can.

Embedded media like images and video can now individually be collapsed

A new preference "Collapse media by default" is also added, the default
is to not collapse media.

Since images are not always shown, "showImage" is also renamed to
"loadImage"

Closes #1187

* Show URL attributes after applying Handlebars.SafeString; Fix #2338

* Check if string before applying safestring.