remove pdtk_check_scroll_on_motion for the time being. (Not sure it's needed, but can revisit if necessary)

removed the array listview code from g_array.c.  Seemed pretty straightforward to prune, but should probably test to make sure there aren't any obscure regressions

add boilerplate for keeping track of toplevel Pd canvases in the GUI. While the GUI knows all the open windows, it can't tell the difference between a Pd toplevel and a subpatch. I'm not sure why the difference is important, but this interface supplies that info to the GUI.

further refined legacy mode to match both iemgui and graph-on-parent objects.

second draft of iemgui handles--- still some bugs when switching between canvas gop rect and iemguis

made nbx scaling less wonky. It's still a bit wonky, but maybe that's just a function of the font resizing algo and the fact that width is constrained to character width

egregiously rough draft of g_numbox scaling-- need to work on the character-width x-scaling which is currently screwy

more predictable results.

added a flawed version scaling for g_mycanvas. (Flawed because cnv's rect is its handle, not the entire visible rectangle

If the GUI is unsuccessful in spawning Pd, use an alert message to tell the user and exit gracefully.