Add support for Shadow DOM interaction and more

Add support for Shadow DOM interaction and more

• Add support for interacting with Shadow DOM elements
  -- (By adding the ::shadow piercing selector)
  -- (See the example test: examples/test_shadow_dom.py)
• Improve Website-TourMaker reliability
  -- (Website Tours will run more smoothly)
• Update console scripts for test generation
  -- (For the sbase mkdir DIR command)
• Make the execute_script() methods more flexible
  -- (Additional parameters can be passed into the script)
• Update Python dependencies:
  -- setuptools>=54.2.0;python_version>="3.6"
  -- soupsieve==2.2.1;python_version>="3.6"
  -- prompt-toolkit==3.0.18;python_version>="3.6"