New switches for `alr build` to apply profile to all dependencies (#1119)

New switches for `alr build` to apply profile to all dependencies (#1119)

* New switches to recursively apply build profiles

* Test for new switches

* Document user-visible changes

* refactor how last profiles are stored

Now we keep track of all dependencies' profiles, so any individual change can
be detected and config files regenerated accordingly.

* Move to --profiles single switch

* Remove aliases

* Update documentation on user changes

* Self-review tweaks

* Code review fixes

* New test for improper list of profiles

* Fix `alr help build` output s/:/=/g

Co-authored-by: GHA <actions@github.com>