Improve demo-mode on mobile device tests

Improve demo-mode on mobile device tests

Update the XPath-to-CSS converter

Update the XPath-to-CSS_Selector converter

Improve ``select_option_by_*()`` methods

Improve select_option_by_*() methods

• Improve select_option_by_text(SELECTOR, TEXT)
• Improve select_option_by_index(SELECTOR, INDEX)
• Improve select_option_by_value(SELECTOR, VALUE)
• Also update pytest and setuptools-scm dependencies

Small updates / Improve reliability

Small updates / Improve reliability:

• Update get_page_title() and combine get_title() into it
• Add skip_test() to avoid using the camelCase version
• Improve reliability for the html_inspector

Ready for Edge/EdgeDriver (Chromium)

Ready for Edge/EdgeDriver (Chromium)

• Update the default EdgeDriver version to 79.0.309.65
• Improve Microsoft EdgeDriver compatibility
• Add test for EdgeDriver and Edge (Chromium) Browser
• Update a Python dependency ("six==1.14.0")
• Also update Firefox preferences
• Update multi-thread detection

Add ``--time-limit=s`` to fail long-running tests

Add --time-limit=s to fail long-running tests

• This removes and replaces pytest-timeout, which wasn't thread-safe

Usage (command-line):
--time-limit=s (fail the tests that run longer than "s" seconds)

Usage (in-test):
self.set_time_limit(s) (fail that test if it runs longer than "s" seconds)

Other unrelated changes:

• Better detection of multi-thread use
• Update click_visible_elements()
• Some minor refactoring

Improve the Logging System

Improve the Logging System:

• Add a timestamp to basic test info logs
• If archiving logs, do it after the tests run (unless multi-threaded)

Usage for archiving logs: --archive-logs
(Log files will be saved to ./archived_logs/)

Improve method reliability

Improve method reliability

Methods effected by the updates:

• find_elements(...)
• find_visible_elements(...)
• click_visible_elements(...)
• click_nth_visible_element(...)
• is_element_in_an_iframe(...)

Reduce unwanted logging messages on Windows

Reduce unwanted logging messages on Windows:

• Avoid logs such as: "DevTools listening on ws://127.0.0.1 ..."
• Also simplify virtualenv installation on Windows with the helper script.

Prevent unused log folders from getting created

Prevent unused log folders from getting created

• Fix issue #466