I originally implemented this as something to use the new sequence
wrapper, however, after having a look at uses with grep.app, it's used
often, for example:
- Bootstrap 5 Dropdowns
- Polymer
- Angular
- Closure
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *