Unused imports for PIL and pypdf in vcon.py cause ModuleNotFoundError with default installation

[slyapustin]

The main vcon.py module contains unused imports for the PIL (Pillow) and pypdf packages, which are not installed by default when running

pip install vcon==0.7.0.

.venv/lib/python3.12/site-packages/vcon/__init__.py:1: in <module>
    from .vcon import Vcon
.venv/lib/python3.12/site-packages/vcon/vcon.py:21: in <module>
    import PIL
E   ModuleNotFoundError: No module named 'PIL'

.venv/lib/python3.12/site-packages/vcon/__init__.py:1: in <module>
    from .vcon import Vcon
.venv/lib/python3.12/site-packages/vcon/vcon.py:20: in <module>
    import pypdf
E   ModuleNotFoundError: No module named 'pypdf'

[linear]

VCO-27 Unused imports for PIL and pypdf in vcon.py cause ModuleNotFoundError with default installation