Make use of the axes "ticklabelinterpreter" property (bug #45438) * plot.txi: add an anchor pointing to usage of interpreter property * genpropdoc.m: document axes "ticklabelinterpreter" property and text "interpreter" property * gl-render.h: new private attribute "interpreter" that stores the interperter to be used in text_to_pixels * gl-render.h (set_interpreter): new protected virtual method to set "interpreter" * gl-render.cc (opengl_renderer::draw_axes): set interpreter before rendering tick labels * gl-render.cc (opengl_renderer::text_to_pixels): make use of interpreter attribute * graphics.cc (axes::properties::set_defaults): initialize "ticklabelinterpreter" instead of unused "interpreter" * graphics.in.h (axes::properties): fix doubly defined defaults for "ticklabelinterpreter" and "interpreter" properties

%!function r = f1 ()
%!  ls = svd (1);
%!  r = eval ("ls -1;");
%!endfunction
%!function r = f2 ()
%!  [u,ls,v] = svd (1);
%!  r = eval ("ls -1;");
%!endfunction
%!function r = f3 (ls)
%!  r = eval ("ls -1;");
%!endfunction

%!test
%! ## Windows systems can't run "ls -1"
%! if (! ispc ())
%!   assert (f1 (), 0);
%!   assert (f2 (), 0);
%!   assert (ischar (f3 ()), true);
%!   assert (f3 (1), 0);
%! endif