misc: close release-2.2 branch release-2.2 tip

misc: close stable-2 branch stable-2

misc: merge from release-3.0 default @

misc: added signature for changeset 6da19f5e870b release-3.0

misc: added tag 3.0.0 for changeset 00cb89db98f1 release-3.0

misc: update before 3.0.0 release-3.0 3.0.0

misc: typo in README.md

misc: update copyright years

nsnake: minor style

nsnake: rename wait to delay to avoid collision with POSIX

(0) -10 tip