v16.5.0

Large number of changes to build system, some changes to directory structure, main library essentially unchanged. Users shouldn't notice a difference other than simpler java usage.

What's Changed

• New cmake build by @whit2333 in #1
• Dev by @jonzarling in #3
• Change branch name on github actions by @jonzarling in #4

New Contributors

• @whit2333 made their first contribution in #1
• @jonzarling made their first contribution in #3

Full Changelog: https://github.com/JeffersonLab/et/commits/v16.5.0