Yaml Parser

[uramirez8707]

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

[wrongkindofdoctor]

Lolz.

[wrongkindofdoctor]

All of the routine comments should be preceded by !> instead of !<

[rem1776]

Sorry, approved this then tried running the tests when I saw it could be merged. The parser test will need to either copy the test yamls or generate them into the build directory, since the test will fail if it's built anywhere but the source .