Improve core functionality (Logging, Config comparison, Code Quality)

[PKief]

Description

• Add logging configuration enableLogging and logLevel
• If logging is enabled the logs are printed to the output "Material Icon Theme"
• All console.log statements have been replaced with the logger
• The logging itself is implement asynchronously with EventEmitter so that log events of the core module can be observed in the extension module
• Improvements of the node fs API usage (async/await instead of sync)
• Writing of files is only done if necessary by the changed config

Logging information can be configured like this:

{
  "material-icon-theme.enableLogging": true,
  "material-icon-theme.logLevel": "debug",
}

Related to #2428.

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[PKief]

#2428 might be fixed with this PR. The write file logic was called too often if it wasn't necessary. It was called if the saturation or opacity was not changed but wrote all of the files in the icons directory with the same content. As there were too many operations on the fs it might have caused some performance issues and removed the content of some SVG files.

[github-actions]

Merge Successful

Thanks for your contribution! 🎉

The changes will be part of the upcoming update on the marketplace.