Demisto-sdk

* Added a validation for invalid id fields in indicators types files in **validate** command.
* Added default behavior for **update-release-notes** command.
* Fixed an error where README files were failing release notes validation.
* Updated format of generated release notes to be more user friendly.
* Improved error messages for the **update-release-notes** command.
* Added support for `Connections`, `Dashboards`, `Widgets`, and `Indicator Types` to **update-release-notes** command.
* **Validate** now supports scripts under the *TestPlaybooks* directory.
* Fixed an issue where **validate** did not support powershell files.

* Added a validation for invalid playbookID fields in incidents types files in **validate** command.
* Added a code formatter for python files.
* Fixed an issue where new and old classifiers where mixed on validate command.
* Added *feedIncremental* field to the integration schema.
* Fixed error in the **upload** command where unified YMLs were not uploaded as expected if the given input was a pack.
* Fixed an issue where the **secrets** command failed due to a space character in the file name.
* Ignored RN validation for *NonSupported* pack.
* You can now ignore IF107, SC100, RP102 error codes in the **validate** command.
* Fixed an issue where the **download** command was crashing when received as input a JS integration or script.
* Fixed an issue where **validate** command checked docker image for JS integrations and scripts.
* **validate** command now checks scheme for reports and connections.
* Fixed an issue where **validate** command checked docker when running on all files.
* Fixed an issue where **validate** command did not fail when docker image was not on the latest numeric tag.
* Fixed an issue where beta integrations were not validated correctly in **validate** command.

* fixed and issue where file types were not recognized correctly in **validate** command.
* Added better outputs for validate command.

* Fixed an issue where changes to only non-validated files would fail validation.
* Fixed an issue in **validate** command where moved files were failing validation for new packs.
* Fixed an issue in **validate** command where added files were failing validation due to wrong file type detection.
* Added support for new classifiers and mappers in **validate** command.
* Removed support of old RN format validation.
* Updated **secrets** command output format.
* Added support for error ignore on deprecated files in **validate** command.
* Improved errors outputs in **validate** command.
* Added support for linting an entire pack.

* Fixed a bug where misleading error was presented when pack name was not found.
* **Update-release-notes** now detects added files for packs with versions.
* Readme files are now ignored by **update-release-notes** and validation of release notes.
* Empty release notes no longer cause an uncaught error during validation.

* Changed the output format of demisto-sdk secrets.
* Added a validation that checkbox items are not required in integrations.
* Added pack release notes generation and validation.
* Improved pack metadata validation.
* Fixed an issue in **validate** where renamed files caused an error