Some variegrated fixes

* Game history: Added a test for iOS Safari's private browsing mode,
which does not disable sessionStorage but does reduce its quota to 0 -
making it hard to tell if it's actually usable.
* Removed the - sign from the set of new bullet point symbols, on the
basis that <<print -2>> prints a bullet-pointed "2". Plus, sentences
starting with a - as a hyphen would be affected.
* Removed unused Wikifier code.
* I hope mth doesn't mind being added to the developer list.