Preinstall sbt 0.12.3 (but default remains 0.12.2)

Note: we should consider remove some 0.11.x if usage decreases
Sphinx 0.9.9 is outdated and no more online

Sphinx Technologies has removed 0.9.x packages (more than 4 years old)
from their download site. Release 1.10-beta is still online, but
recommended releases are now 2.0 and 2.1.
Add (very tolerant) foodcritic linter

Cookbooks unchanged, all failing FCxxx tags allowed for now...
Foodcritic: enable rule FC042

Prefer 'include_recipe' to 'require_recipe' (deprecated)