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 *
Just have all the timing functions return 0 for now.
We can now run the Shynet JS on https://linus.dev/ although the XHR
is rejected by our same-origin policy.
