Cleanup, format fixes, SPDX license headers, and misc. small stuff #2
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Adds SPDX-License-Identifiers to all source file headers that have a license defined.
This makes it easier machine and human readable.
See this for an intro about SPDX license headers:
https://www.linuxfoundation.org/blog/2018/08/solving-license-compliance-at-the-source-adding-spdx-license-ids/
Or this for a list of them:
https://spdx.org/licenses/