Rename plugin class

[didoda]

This fixes a deprecation in cakephp 5.3:

Since 5.3.0: Loading plugins with a plugin class named `Plugin` is deprecated. Rename the class to `WebToolsPlugin` instead.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f306050) to head (5348f94).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #113   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       277       278    +1     
===========================================
  Files             28        28           
  Lines            862       864    +2     
===========================================
+ Hits             862       864    +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.