Automatically log out of Casdoor when logging out of WordPress

[7encoder]

Fix: #22

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✅ 7encoder
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[hsluoyz]

@7encoder need to pass CI checks:

[codecov]

Codecov Report

❌ Patch coverage is 9.61538% with 47 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@5f9cd6f). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
Casdoor.php	10.00%	45 Missing ⚠️
includes/admin-options.php	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #28   +/-   ##
=========================================
  Coverage          ?   21.48%           
  Complexity        ?       47           
=========================================
  Files             ?        4           
  Lines             ?      242           
  Branches          ?        0           
=========================================
  Hits              ?       52           
  Misses            ?      190           
  Partials          ?        0           

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[7encoder]

It was complaining about the plugin version, it should be fixed now.

[hsluoyz]

@7encoder it's too big PR. I suggest you only committing code that are related to the topic: auto logout

[hsluoyz]

One topic, one PR