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* Support custom fields on the Livechat registration form.

* Remove unnecessary console.log.

* Update stories.js

* Display input validation errors.

* Fix review
Co-authored-by: Guilherme Gazzo <guilhermegazzo@gmail.com>

* Improve Offline Message UX/IU.

* Use window.location.origin.

100% translated in Serbian Cyrillic.

* master:
  Release 1.4.0

Release 1.4.0

* origin/master:
  Release 1.3.1 (#365)

* Add new setAgent API method.

* Removed unnecessary parameter.

* Add the setAgent method to the initialize method.

* Update src/lib/hooks.js

* Update src/widget.js
Co-authored-by: Tasso Evangelista <tasso.evangelista@rocket.chat>

* [FEAT] added setTitle() method

* removed initial customTitle value from store

* removed unnecissary props variable

* updated customtile property

* added customTile in more required components

* added initialize function

* updated initialize function

* added check for array param

* [FIX] Livechat guest avatar using name instead of username

* added more checks

* updated helper function

* updated function and added story

* Adds cross-tab communication trough the localStorage changes.

* Revert changes on widget-demo.

* Add return statement.

* Removed unnecessary parameter.

* Replace(overwrite) nonPeristable props over storedState.

Corrected German title for  finished chat

Suggested Spanish translation

* Add Service Offline callback.

* Call OnServiceOffline callback before rendering LeaveMessage component.

* Add two new features:
- New API's to minimize/maximize the Widget;
- Deal with a new setting to hide Agent information;

* Improvements on the codebase.

* Removed implementations related to minimize / maximize the widget.

* Handle empty agent object on Screen component

* Fix Storybook knobs bugs

* Update Screen story

* Handle agent.hiddenInfo on Screen header

* Hide typing when agent.hiddenInfo is set

* Remove agent information on messages when agent.hiddenInfo is set

* Deal with agentHiddenInfo setting to check the agent data visibility.