More efficient bounding box calculations. And moved to base class.

packages/python/README.md

packages/python/pyproject.toml

packages/python/src/snip/snippets/array.py

packages/python/src/snip/snippets/base.py

packages/python/src/snip/snippets/image.py

packages/python/src/snip/snippets/text.py

packages/python/tests/test_api.py

packages/python/tests/test_snippets/test_array.py

packages/python/tests/test_snippets/test_base.py

packages/python/tests/test_snippets/test_image.py

packages/python/tests/test_snippets/test_text.py