Description

• Adds fortran wrappers to libyaml. All the code is hidden in a -Duse_yaml macro, so users that do not want to use the yaml parser won't have to have libyaml installed
• Adds unit test to test if the parser is working/crashing as expected (the test script will need be updated to use Test script updates and input tests #800)
• Adds an option, --with-yaml to autotools that checks that the environment is set up correctly and adds the -Duse_yaml macro to your compilation.
• Implements the parser to read data_table.yaml and tests this using an ongrid data_override test

To do:

• Modify the cmake build similarly to the autotools build
• Add libyaml to github actions containers and add a test with --with-yaml

Fixes # (issue)

How Has This Been Tested?
intel21 and gnu 9.3 on skylake

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes