Bugfix 45 addons config

[jwloka]

This PR changes the handling of addons and targets in the compiler. The main changes include:

• Method calls for retrieving addons need to include a target parameter (e.g., getAvailableAddons())
• Refining the logic for handling targets, compilationConfig and loaderOptions in webpack override properties from config files.
• Adding documentation comments to explain the use of configuration options

Improvements to addon handling:

Updated the getAvailableAddons method to include a target parameter in test cases.
Modified the getAvailableAddons method to handle the * target more effectively.
Updated multiple test cases to include the * target parameter when calling getAvailableAddons.

Enhancements to target handling:

Removed the default assignment of ["*"] to targets in the setOptions method.
Added documentation comments for the targets and transpileOnly properties.
Added documentation comments for various properties, including addons, addonsDir, and targets.

Code simplification and consistency:

Simplified the assignment of projectDirectory using optional chaining.
Added default targets to CompilationEnv and updated the getActiveAddons method to accept a target parameter.

These changes improve the flexibility and clarity of the compiler's handling of addons and targets, ensuring that the correct addons are used based on the specified targets.