Flag the smiley helper and shopping cart as deprecated.

They should be removed the next minor release.
Lowered the "javascript" deprecation message to "important" instead of "warning", for consistency with the rest of CI.
Signed-off-by:James L Parry <jim_parry@bcit.ca>
Merge pull request #3388 from jim-parry/fix/deprecation

Flag the smiley helper and shopping cart as deprecated.