This code has been in the viewer source for a long time,
and hasn't been used for a long time (furtherest back that
I checked was Snowglobe 1.4).
Most notably, this removes LLContextURLExtractor and code
that used it because that required an API where AICurlEasyHandle
is created before an url is known, which gets in the way of
reusing connections.
Fixed by updating indra/cmake/WebKitLibPlugin.cmake with
version from imprudence.
This commit also contains removal of execute permissions
of source files and configure files, sorry...
