paktools-v0.2

Second prerelease. Still no safety checks so be a little careful with what you extract and make sure they are actual package files.

Breaking:

• Command line usage has changed. You can now extract and rebuild package files really easily.
  Extracting to the myPackage folder: ./paktools myPackage.pak
  Extracting to the someFolderName folder: ./paktools -o someFolderName myPackage.pak
  Rebuilding using files in myFolder to create myFolder.pak: ./paktools myFolder
  Rebuilding using files in thisFolder to create myPackage.pak: ./paktools -o myPackage.pak thisFolder
  I think you get the gist.

Improvements:

• Due to the changes to the CLI, you can now drag-and-drop files.
• Now using picocli, check out the help by typing ./paktools --help
• Added GraalVM, paktools is now a self-contained executable
• Upgraded to Java 17, and we now use Gradle
• Rewrote extraction and reconstruction logic to use ByteBuffers more efficiently (hello ByteChannels)

Bugfixes:

• Dummy entries are now handled better