added nc_view

The 'nc_view' class is an attempt to work around the ncurses method of creating
windows, but it it presently failing.  Beginning work on 'nc_window', which
will wrap the ncurses window structure instead.

In order to make 'nc_view' work properly, I would need to parse any string
given to its 'print' method for any control characters and update the cursor
accordingly.  This is waaaay too much work for something that ncurses already
does.  I'll probably work on a cross-platform ncurses replacement someday...
either that or implement 'nc_api' for the Windows API...
Removing doc folder; library user can run 'doxygen' when they need it.