Currently Create uses branch to mark releases (and they don't seem to have any activities after creation), so it's more appropriate to use tags, which are designed to be releases.
Branches make git branch -a and any Git GUI tool checkout look quite messy.

This is the intended flow from now on, we've stopped using the branch-per-feature system. Up to @simibubi what he wants to do with the existing branches.

Replaced all the dead branches with appropriate tags, see https://github.com/Creators-of-Create/Create/releases.
Development branches are now mc1.14/dev and mc1.15/dev