Fixed-Strain diffusion flames

[bigfooted]

Proposed Changes

Give a brief overview of your contribution here in a few sentences.

1. add option to create fixed strain diffusion LUT
2. when flamelet files (.yaml) exist, restart from these solutions
3. additional plotting options to create x,y figures and 2d flat contour figures.

PR Checklist

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• I am submitting my contribution to the develop branch.
• I have updated the list of python modules in required_packages.txt and environment.yml, if necessary.
• I have properly commented my changes.
• I have updated the documentation, if necessary.
• I have added a test case that demonstrates my contribution, if necessary.