Consolidated Sugarcane/Responsive code

* Consolidated the Javascript of Sugarcane and Responsive so that they
are now almost identical. This included folding the HTML5 History code
into Responsive and the storearea obfuscation code into Sugarcane, among
other things.
* Fixed a bug in a previous <blockquote> fix.
* Changed some of the <head> HTML in the two formats, in particular
using the HTML5 <meta charset="utf-8"> tag.
* Added "continued line" and "HTML tag" syntax to the Sugarcane
Wikifier. See these pages for rationale:
http://www.glorioustrainwrecks.com/node/5400
http://www.glorioustrainwrecks.com/node/5452
* Removed unused textPrimitives.
* tweelexer.py: Fixed a syntax highlighting bug.