Fix Updater module

[austinmatherne-wk]

Reason for change

#247

Description of change

• For the Updater module:
  • Makes it work again on mac and windows
  • Adds warning messages when something goes wrong
  • Adds type hints
  • Adds test coverage

Steps to Test

• load the GUI (python arelleGUI.pyw)
• use the check for updates feature in the help menu
• experiment with changing the date in arelle/Version.version to be:
  • older than the latest update
  • newer than the latest update
  • the same as the latest update

review:
@Arelle/arelle @codebykevin

[aviary3-wk]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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Questions or Comments? Reach out on Slack: #support-infosec.

[stevenbronson-wk]

Tested on OS X. The updater offers and successfully downloads newer versions, notifies if the current version is newer than the download version, and notifies if the current version is the same as the download version. It warns if it can't connect to the update server.