New clipboard API for front ends, and textarea progress

Text inputs and textareas used in HTML forms have never been robust and we've decided to fix them for NetSurf 3.0. Since the existing implementation is unmaintainable, the plan is to make html forms use the desktop/textarea.{c|h} widget (which is currently used for Hotlist node editing and the Atari URL bar). The first stage of this is to add all the extra functionality we require to the desktop/textarea widget, including clipboard support. I've updated the front end clipboard API so now it can be used outside browser windows, and to remove use of the html/text-plain selection structure: http://source.netsurf-browser.org/netsurf.git/commit/?id=e93fae7f2d9fdcc4... The Atari, Amiga, and BeOS front ends all need updated. The RISC OS front end needs attention so that it can paste when another application has ownership of the clipboard. -- Michael Drake (tlsa) http://www.netsurf-browser.org/