I used this chance to make some name changes, add some utils, tweak some
imports, remove more `setTitle`s and so on. I also made person, repo,
key and project creation forms verify CI-uniqueness.
I decided to add some safety to routes:
- Use dedicated newtypes
- Use CI for the CI-unique DB fields
Since such a change requires so many changes in many source files, this
is also a chance to do other such breaking changes. I'm recording the
change gradually. It won't build until I finish, so for now don't waste
time trying to build the app.
