main/*: improve license identifiers
Mostly ensuring the use of the spdx identifiers.
Supersedes !58967 (closed), !55261 (closed), !55263 (closed)
Edited by Sertonix
We are currently working on getting Alpine Linux 3.21 out. This means that merge requests that are not aimed to help with that (only affecting testing, new aports) have a lower priority at the moment. Please be patient, they will be eventually picked up.
Mostly ensuring the use of the spdx identifiers.
Supersedes !58967 (closed), !55261 (closed), !55263 (closed)