Automated conda build

[shimwell]

Proposed changes

This PR is another step towards a conda package. This allows the conda package to be built, and pass the conda based tests.

cadquery-jupyter is now optional and the functions that make use of it return a warning message when it is not importable.
This allows the conda based tests to pass without having the package installed.

the circle ci and github action based tests run in an environment with jupyter-cadquery installed so these should be unaffected.

This PR fixes issue #49

Additionally the version number of the conda package is now taken from the setup.py and also the python version is now taken from the conda_build_config.yaml file. These make the build process more compatible with github actions based automation.

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

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• Pep8 applied
• Unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[codecov]

Codecov Report

Merging #51 (97d1158) into develop (89c77fc) will decrease coverage by 0.39%.
The diff coverage is 48.48%.

@@             Coverage Diff             @@
##           develop      #51      +/-   ##
===========================================
- Coverage    94.61%   94.21%   -0.40%     
===========================================
  Files           76       76              
  Lines         5183     5207      +24     
===========================================
+ Hits          4904     4906       +2     
- Misses         279      301      +22     

Impacted Files	Coverage Δ
paramak/utils.py	87.04% <28.57%> (-2.68%)	⬇️
...tric_components/tokamak_plasma_plasmaboundaries.py	91.30% <50.00%> (-8.70%)	⬇️
paramak/reactor.py	89.75% <54.54%> (-0.95%)	⬇️
paramak/shape.py	96.42% <54.54%> (-0.66%)	⬇️

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[shimwell]

The parts that are untested are the try except loops that try to import jupyter-cadquery and prevent conda tests failing