IntroduceIdentityPage: Don't obtain PluginRespirator from WOT, WebPageImpl already has it in a member variable.
IntroductionPuzzle: Limit length of ID
- The limit matches exactly the format which we construct puzzle IDs currently, see OwnIdentroductionPuzzle constructor
- Notice that this does not fix a vulnerability: When importing puzzles from XML, there was always a size limit for the XML, so the ID could not be infinitely long.
Merge branch 'master' into web-interface-revamp