PSXPackager v1.6.1 - 7zip support for Linux/OSX

Note: This version is missing some files and fails to run, so binaries have been removed. Please download the latest vesion.

This version brings 7z support to Linux and OSX CLI through the SharpCompress library.

• The framework requirement has been lowered back to .NET 6.0 as this is more prevalent on popular distros as of now.
• A bug when the output folder name has a dot has been fixed

Many, many thanks to @takano32 for putting this and the build pipeline together.