blender-package-manager-addon/__init__.py

bl_info = {
    'name': 'Package Manager',
    'description': 'Testing package management',
    'category': 'System',
    'support': 'TESTING',
}
import bpy

class PackageSettings(bpy.types.PropertyGroup):
    url = bpy.props.StringProperty(name="URL")

# class PackageManager:
    # # For some reason accessing 'settings' PointerProperty via wm.package_manager.settings gives a value error
    # # but accessing it when not stored in this class (wm.package_manager_settings) is fine?
    # # settings = bpy.props.PointerProperty(type=PackageSettings)
    # pipes = []

def register():
    from . import (pkg_ops, pkg_ui)

    bpy.utils.register_class(PackageSettings)
    # bpy.types.WindowManager.package_manager = PackageManager()
    bpy.types.WindowManager.package_manager_settings = bpy.props.PointerProperty(type=PackageSettings)
    pkg_ops.register()
    pkg_ui.register()

def unregister():
    from . import (pkg_ops, pkg_ui)

    pkg_ops.unregister()
    pkg_ui.unregister();
    bpy.utils.unregister_class(PackageSettings)
    del bpy.types.WindowManager.package_manager