issue#178 Refactor Subplugins Calls

[ScottVerbeek]

Note: Please fill out all relevant sections and remove irrelevant ones.

🔀 Purpose of this PR:

• Adds a new feature of functionality
• Improves or enhances existing features
• Refactoring: restructures code for better performance or maintainability
• Testing: add missing or improve existing tests

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📝 Description:

This merge request will add the functionality to add lifecycle sub plugins outside of the lifecycle plugin. This way one can develop a plugin seperately, eg https://github.com/catalyst/moodle-tool_lcprunecourselogstep

For more information on what this is and how it works see the issue #178

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📋 Checklist

Please confirm the following (check all that apply):

• I have phpunit and/or behat tests that cover my changes or additions.
• Code passes the code checker without errors and warnings.
• Code passes the moodle-ci/cd pipeline on all supported Moodle versions or the ones the plugin supports.
• Code does not have var_dump() or var_export or any other debugging statements (or commented out code) that
  should not appear on the productive branch.
• Code only uses language strings instead of hard-coded strings.
• If there are changes in the database: I updated/created the necessary upgrade steps in db/upgrade.php and
  updated the version.php.
• If there are changes in javascript: I build new .min files with the grunt amd command.
• If it is a Moodle update PR: I read the release notes, updated the version.php and the CHANGES.md.
  I ran all tests thoroughly checking for errors. I checked if bootstrap had any changes/deprecations that require
  changes in the plugins UI.

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🔍 Related Issues

• Related to Improving sub plugins design #178

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🧾📸🌐 Additional Information (like screenshots, documentation, links, etc.)

Here is how the refactor would work. After installing the tool with this version. You can add plugins outside of the support of the core set. This would reduce the maintainability of what may be an ever growing list of triggers and steps. You can install for example:

• https://github.com/catalyst/moodle-tool_lcprunecourselogstep

[ScottVerbeek]

Just a heads up that I am working on the CI phpcs issues.