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 *
This is done using a wrapper model that transforms all the information
about a single process in the ProcessModel and turns it into a 2-column
table model with only that process in it.
