refactor: use PyQT5 for window display (#49)

* wip: use PyQT5 for window display

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* wip: first slide is shown

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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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/manim.py

@@ -2,6 +2,7 @@ import os
 import sys
 from contextlib import contextmanager
 from importlib.util import find_spec
+from typing import Iterator
 
 __all__ = [
     "MANIM",
@@ -21,7 +22,7 @@ __all__ = [
 
 
 @contextmanager
-def suppress_stdout() -> None:
+def suppress_stdout() -> Iterator[None]:
     with open(os.devnull, "w") as devnull:
         old_stdout = sys.stdout
         sys.stdout = devnull
@@ -65,8 +66,6 @@ else:
     )
 
 
-FFMPEG_BIN = None
-
 if MANIMGL:
     from manimlib import Scene, ThreeDScene, config
     from manimlib.constants import FFMPEG_BIN