- Add copyright headers to files that did not already have them
- Update the year to the last year the file was modified in files with
existing headers.
Allow specifying "augmentations" and "all" as the plugin kind to lost.
In the case of of the former, instruments and output processors get
listed. In the case of the latter, every plugin kind gets listed.
Changing the way target descriptions work from a static mapping to
something that is dynamically generated and is extensible via plugins.
Also moving core target implementation stuff under "framework".