TODO:

* DONE - turn off on page reload
* DONE - ask user if smth is unsaved on page leave
* DONE - export to file (?)
* DONE improve text determining for a text (if it's a text only content - approve)
* DONE- trim phrases
* DONE publish
* DONE - on focus change issue

* determine real text existence
* remove events from page or freeze mode (???)
* ability to load previous session
* https://github.com/mozilla/localForage