Demisto-sdk

* Fixed an issue where paybooks **generate-docs** didn't parse complex input values when no accessor field is given correctly.
* Fixed an issue in the **download** command, where an exception would be raised when downloading system playbooks.
* Fixed an issue where the **upload** failed on playbooks containing a value that starts with `=`.
* Fixed an issue where the **generate-unit-tests** failed to generate assertions, and generate unit tests when command names does not match method name.
* Fixed an issue where the **download** command did not honor the `--no-code-formatting` flag properly. maxgubler
* Added a new check to **validate**, making sure playbook task values are passed as references.
* Fixed an issue where the **update-release-notes** deleted existing release notes, now appending to it instead.
* Fixed an issue where **validate** printed blank space in case of validation failed and ignored.
* Renamed 'Agent Config' to 'XDRC Templates'.
* Fixed an issue where the **zip-packs** command did not work with the CommonServerUserPython and CommonServerUserPowerShell package.

* Fixed parsing of initialization arguments of client classes in the **generate-unit-tests** command.
* Added support for AgentConfig content item in the **upload**, **create-id-set**, **find-dependecies**, **unify** and **create-content-artifacts** commands.
* Added support for XSIAM Report preview image.

* Fixed an issue where the **upload** command did not work with the CommonServerUserPython package.
* Fixed an issue in the **download** command, where some playbooks were downloaded as test playbooks.
* Added playbook modification capabilities in **TestSuite**.
* Added a new command **create-content-graph**.
* Fixed an issue in the **upload** command, where the temporary zip would not clean up properly.
* Improved content items parsing in the **create-content-graph** command.
* Added an error when the docker daemon is unavailable when running **lint**.
* Removed the validation of a subtype change for scripts in the **validate** command.
* Fixed an issue where names of XSIAM content items were not normalized properly.
* Fixed an issue where the **download** command was downloading playbooks with **script** (id) and not **scriptName**.
* Fixed an issue where script yml files were not properly identified by `find_type`.
* Removed nightly integrations filtering when deciding if a test should run.
* Added support for XSIAM Dashboard preview image.
* Added the `--no-code-formatting` flag to the **download** command, allowing to skip autopep8 and isort.
* Fixed an issue in the **update-release-notes** command, where generating release notes for modeling rules schema file caused exception.

* Fixed an issue where the **doc-review** command showed irrelevant messages.
* Fixed an issue in **validate**, where backward-compatibility failures prevented other validations from running.
* Fixed an issue in **validate**, where content-like files under infrastructure paths were not ignored.
* Fixed an issue in the AMI mapping, where server versions were missing.
* Change the way the normalize name is set for external files.
* Added dump function to XSIAM pack objects to dulicate the files.
* Fixed an issue where the `contribution_converter` did not support changes made to ApiModules.
* Added name normalization according to new convention to XSIAM content items
* Added playbook modification capabilities in **TestSuite**.
* Fixed an issue in create-content-artifacts where it will not get a normalize name for the item and it will try to duplicate the same file.

* Fixed an issue in the **format** command where fail when executed from environment without mdx server available.
* Added `Added a`, `Added an` to the list of allowed changelog prefixes.
* Added support for Indicator Types/Reputations in the **upload** command.
* Fixed an issue when running from a subdirectory of a content repo failed.
* Changing the way we are using XSIAM servers api-keys in **test-content** .
* Added a success message to **postman-codegen**.

* Fixed an issue in the **validate** command where incident fields were not found in mappers even when they exist
* Added an ability to provide list of marketplace names as a param attribute to **validate** and **upload**
* Added the file type to the error message when it is not supported.
* Fixed an issue where `contribution_converter` incorrectly mapped _Indicator Field_ objects to the _incidentfield_ directory in contribution zip files.
* Fixed a bug where **validate** returned error on empty inputs not used in playbooks.
* Added the `DEMISTO_SDK_CONTENT_PATH` environment variable, implicitly used in various commands.
* Added link to documentation for error messages regarding use cases and tags.