small fixes following #21

[carlocastoldi]

This PR:

• uses intersect_with_plane() from newest vedo instead of the backported function as there is no longer the need to duplicate code from an updated dependency thanks to Bring package up to date #21
• fixes some vedo function calls still using lowerCamelCase instead of snake_case

Additionally I changed Plane.from_norm() typing to return a Self type instead of a vd.Plane because, well, that's what it returns. If this is a problem because typing.Self is not in previous python version, I can just remove the type hinting

[adamltyson]

Hi @carlocastoldi, thanks for this PR!

We're currently supporting Python 3.9, 3.10 & 3.11, so unfortunately we can't use any functionality that's only available in newer versions. mypy is also complaining with:

brainglobe_heatmap/plane.py:1: error: Module "typing" has no attribute "Self"  [attr-defined]
brainglobe_heatmap/plane.py:1: note: Use `from typing_extensions import Self` instead
brainglobe_heatmap/plane.py:1: note: See https://mypy.readthedocs.io/en/stable/runtime_troubles.html#using-new-additions-to-the-typing-module
Found 1 error in 1 file (checked 17 source files)

Would you mind fixing (or removing) the typing, then I'll review.

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[adamltyson]

LGTM, thanks @carlocastoldi!