use capital letter of each word for axolotl main structures

[alessandrofelder]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?

The draft acronyms for higher-level ("main structure") axolotl brain regions could be nicer.

What does this PR do?

• Uses the first letter of all words in the higher-level region names as the acronym, as suggested by @adamltyson.
  For example, "Olfactory bulb" is abbreviated OB and "Telencephalon" gets the acronym T.
• also passes the minor version 0 to the wrapup function, as this will be the first release (1.0.0) of this atlas in BrainGlobe.

References

Closes #341

How has this PR been tested?

Checking that for a locally generated version of the atlas, I can make a NapariAtlasRepresentation and call add_structure_to_viewer("T") and add_structure_to_viewer("OB") on it, and appropriate region meshes appear in 3D. Also, manual inspection of the generated structures.json file.

Is this a breaking change?

Nope

Does this PR require an update to the documentation?

When we publish the atlas, but not right now.

Checklist:

• The code has been tested locally
• [n/a] Tests have been added to cover all new functionality (unit & integration)
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

cc @saimaabdus19

[adamltyson]

Looks good.

FYI the version will be 1.0 (not 1.0.0), as yet we don't have patch versions.