Fixed fonts for draw/fill char/string. On my display I require
GDISP_SOFTWARE_TEXTFILLDRAW for filled char/string but that may because
my display blit may be broken.
Also found that code in header files doesn't have debug symbols
generated for it so I converted the include files that contained code
into real C files and altered the halext.mk to match.
This new driver contains no hardware dependancies and so it can be used
accross platforms to ensure the halext build system is working
correctly. Just don't expect dots to appear on the non-existant display.
:)