Switch to python build script, add plugin-specific builds, and add github workflow

[SilentSpud]

• Switched from system Qt to PySide6 for building resources.py
• Replaced build script with a python script that can build specific plugins
  • SVGs are minified with scour before compressing
• Moved python and svg files to src folder to separate source from utilities
• Added workflow for building all plugin-specific and bundled zips and creating a release
  • The workflow's manual-only at the moment and only asks for the tag name at run time. Extra details have to be edited after the fact

[deorder]

Thank you. I tried it out locally and it works well. Much better.