Demisto-sdk

* Fixed an issue where the incident and indicator field BC check failed.
* Support for linting and unit testing PowerShell integrations.

* Fixed an issue where validate failed on Windows.
* Added a validator to verify all branches are handled in conditional task in a playbook.
* Added a warning message when not running the latest sdk version.
* Added a validator to check that the root is connected to all tasks in the playbook.
* Added a validator for Dashboards (dashboard-*.json).
* Added a validator for Indicator Types (reputation-*.json).
* Added a BC validation for changing incident field type.
* Fixed an issue where init command would generate an invalid yml for scripts.
* Fixed an issue in misleading error message in v2 validation hook.
* Fixed an issue in v2 hook which now is set only on newly added scripts.
* Added more indicative message for errors in yaml files.
* Disabled pykwalify info log prints.

* Added a BC check for incident fields - changing from version is not allowed.
* Fixed an issue in create-content-artifacts where scripts in Packs in TestPlaybooks dir were copied with a wrong prefix.

* Added a validation that incident field can not be required.
* Added validation for fetch incident parameters.
* Added validation for feed integration parameters.
* Added to the *format* command the deletion of the *sourceplaybookid* field.
* Fixed an issue where *fieldMapping* in playbook did not pass the scheme validation.
* Fixed an issue where *create-content-artifacts* did not copy TestPlaybooks in Packs without prefix of *playbook-*.
* Added a validation the a playbook can not have a rolename set.
* Added to the image validator the new DBot default image.
* Added the fields: elasticcommonfields, quiet, quietmode to the Playbook schema.
* Fixed an issue where *validate* failed on integration commands without outputs.
* Added a new hook for naming of v2 integrations and scripts.

* Fixed an issue where *create-content-artifact* was not loading the data in the yml correctly.
* Fixed an issue where *unify* broke long lines in script section causing syntax errors

* Added *generate-docs* command to generate documentation file for integration, playbook or script.
* Fixed an issue where *unify* created a malformed integration yml.
* Fixed an issue where demisto-sdk **init** creates unit-test file with invalid import.