First draft of search bar for canvas. This still has a bug-- if you're editing a box before you click the shortcut, the events get screwed up temporarily

This happens with [get], for example-- the bottom of the g extends over part of the outlet. I'm trying to keep the box sizes exactly the same as
Pd-Vanilla, so either the text will be too tall or too narrow. By making it a bit too tall it's more legible at smaller font sizes, and the text fits the width of the box perfectly.

make controls for transforming butterfly demo more foolproof (large scaling factors can be annoying)

code for this is ugly (i.e., repetitive) and can probably be easily abstracted/refactored...

use correct y-offset for font positioning

add a flag to drawsymbol/number visfn to allow updating existing objects instead of having to erase/redraw them

Make it possible to just send new attributes to GUI for [drawpolygon] and friends when a field value changes
(This performs better than erasing and redrawing the scalar in the GUI)

slight change to msg/obj box text y-position to keep hanging letters like "g" from overlapping the xlet

match line-height between svg text and div text

add note in todo about potential loss of data when > 4096 bytes of data
are entered into a message box and sent to Pd