Resolve "Support XML tags specifying version changes of config file parameters"

What does this MR do?

• Add new attributes to dorie.parscraper.Parameter for version changes. These attributes are dictionaries to be filled with version number (string) and description values.

• Update XML parser to read version change tags. Three new tags are introduced: versionadded, versionchanged, and deprecated. They take the version as tag and an optional description as text:

  <versionchanged version="1.1"> Explanation goes here </versionadded>

• Add a Python unit test reading a pre-defined XML file and comparing the parser result with the intended result.

• Fix the YAMLLoader warning during CMake configuration by using the unsafe loader explicitly.

Is there something that needs to be double checked?

No

Can this MR be accepted?

• Implemented support for version XML tags
  • Added Parameter attributes
  • Updated XML parser
• Added tests:
  • test_xml_param_parser.py
• Added documentation on parameter XML files: doc/default_files/README.md
• Pipeline passing
• Squash option set
• Delete branch option set
• Added entry to CHANGELOG.md

Related issues

Closes #166 (closed)