* initial version of task export/import feature

* fixed tests

* CLI

* fix comments

* updated license headers

* fix eslint issues

* fix comments

* fixed comments

* reverted changes in *.md files

* fixed comments

* fix pylint issues

* fix import for share case

* improved unit tests

* updated changelog

* fixed Maria's comments

* fixed comments

* Fixed position of create new task button

* Fixed span position

* fixed comments
Co-authored-by: NNikita Manovich <nikita.manovich@intel.com>
Co-authored-by: NBoris Sekachev <boris.sekachev@intel.com>