Reduce single entire inline licenses to their SPDX declarations.
Some code by Juergen Perlinger refers to the NTP copyright file. I changed this to an SPDX declaration of the NTP license. Unity code files contained this: "[Released under MIT License. Please refer to license.txt for details]". I changed this to an SPDX declaration of the MIT license. I did *not* attempt to reduce or tagify other nonstandard license inclusions, or licenses in files marked "generated", or any license in a file with more than one license. These will take a separate pass with some judgment calls. I also removed some RCS debris.
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