refactor: use PyQT5 for window display (#49)

* wip: use PyQT5 for window display

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* wip: first slide is shown

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* wip: pushing non-working code

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* wip: some logging

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* feat: new configuration wizard working

* fix: prevent key error

* wip: making action work

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* wip: soon done! info + video

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* fix: bugs in sleep and exiting

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* try: offscreen

* fix: pop default value if not present

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* feat: add aspect ratio option

* chore: typing wip

* fix: now() function returns seconds, not milliseconds anymore

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

manim_slides/main.py

@@ -9,7 +9,7 @@ from .wizard import init, wizard
 @click.group(cls=DefaultGroup, default="present", default_if_no_args=True)
 @click.version_option(__version__, "-v", "--version")
 @click.help_option("-h", "--help")
-def cli():
+def cli() -> None:
     """
     Manim Slides command-line utilities.