User:Aidan9382/sandbox/header

Edit header andboxes:
 * sandbox 1, sandbox 2 .1 and sandbox 3, when one just doesn't cut it
 * sandboxjson for unique pagetype testing
 * sandboxmessy - the literal sandbox
 * SafeEnvironmentTesting - somewhat defunct sandbox, still sometimes used for certain tests
 * Lua-Logo.svg Module:Sandbox/Aidan9382 - module coding

Any linter errors here are likely