Adding export h5m using brep gmsh method

[shimwell]

Proposed changes

This PR allows the paramak to export h5m files for reactors and shapes.

This is achieved by using Gmsh and Brep files and a couple of recently create packages brep_part_finder and ```brep_to_h5m``

The workflow is nearly there but additional work is needed to get the conda install working in all cases. This is because Moab is needed for the h5m file creation but it is not currently available on with the conda install on windows. Therefore different conda instructions will be needed for windows and linux/mac.

The installation instructions will also need updating, at this point the pip install option will need to include extra conda installs for moab and gmsh.

This should only be merged once the next version of cadquery has been released. This is because features from the master branch of CQ are needed.

Types of changes

What types of changes does your code introduce to the Paramak?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code refactoring
• Documentation Update (if none of the other choices apply)
• New tests

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)