remove unecessary inclusion of desktop search header in content
header which has knock on effect of not having ctype or string
system headers dragged in unecessarily.
Futher this highlighted use of ctype API where internal ascii
processing ought to be used.
Added content interface for search.
Removed bw->cur_search search context. Desktop layer now does nothing
except pass search requests from front end onto the bw's current_content
via the content interface.
Search API reduced to a pair of functions at each level:
{desktop|content|html|textplain}_search
and
{desktop|content|html|textplain}_search_clear
Updated front ends to use simplified search API. Only tested GTK and RO builds.
These confine the search stuff to render/. However search still uses struct
selection. The handling for which is still spread over desktop/ and render/.
Also the render/search code itself still fiddles inside html and textplain
privates.
+ Split up browser window and content related elements of html & text search.
+ Associate search contexts with contents, rather than browser windows.
+ Remove highlighting of search terms dependency on current_redraw_browser.
+ Fixes issues with search contexts being applied to the wrong content.
svn path=/trunk/netsurf/; revision=12646
