Merge branch 'lib-seal-2-upgrade-dependents-with-vereign-lib-seal-and-get-rid-of-legacy-code' into 'master'

[Lib Seal introduction] Replace SealService from @vereign/light-utils with the one from @vereign/lib-seal

See merge request !26

Resolve "Upgrade light-utils and lib-mime"

Closes #3

See merge request !25

Add CI tests

See merge request !24

"Rework normalisation logic to handle new seal templates"

Closes #2

See merge request !22

Merge branch '2-rework-normalisation-logic-to-handle-new-seal-templates' of code.vereign.com:code/js-toolbox/mime-normalizer into 2-rework-normalisation-logic-to-handle-new-seal-templates