Add native Apple Silicon support by upgrading qt5 to qt6 (#523)

* initial upgrade

* fix epub icon

* pyside6

* fix tray icon

* add spaces

* add comment back

* change exec

* edit shared

* Add CheckState enums

* add mozJpeg

* fix batch

* import CheckedState

* remove references to qt5

* add mozJpeg warning

* Update package-linux.yml

* Update package-linux.yml

* Update Dockerfile-base

* Update README.md

* Update package-linux.yml

* Update README.md

* Update README.md

* add mozjpeg to gitignore

* add warning text

* fix state issue

* use same settings save location as qt5

* remove space

* remove mozJpeg

* update Dockerfile-base file version

* use getattr instead of eval

* undo readme changes

* undo conda

* undo gitignore

---------

Co-authored-by: Alexander Xu <alexanderx@qualtrics.com>
Co-authored-by: darodi <4682830+darodi@users.noreply.github.com>

kindlecomicconverter/comic2ebook.py

@@ -40,10 +40,7 @@ from PIL import Image
 from subprocess import STDOUT, PIPE
 from psutil import virtual_memory, disk_usage
 from html import escape as hescape
-try:
-    from PyQt5 import QtCore
-except ImportError:
-    QtCore = None
+
 from .shared import md5Checksum, getImageFileName, walkSort, walkLevel, sanitizeTrace, subprocess_run_silent
 from . import comic2panel
 from . import image