These helpers will be useful in preparation for supporting multiple
displays, e.g. to measure distances to other screens or figure out
where rectangles are located relative to each other.
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 *
