*added a fallback sr in case everything else fails

 *added check whether a window is visible before requesting resizing of a text object box (fixes otherwise benign error reports, Nicola Pandini reported)

*fixed regression where audio properties misreported sampling rate

fix feature for putting array in existing graph
add a delete checkbox for graphs with multiple arrays

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

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)

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

change fielddesc_getfloat to fielddesc_getcoord so that the (admittedly arcane) scaling/quanta syntax can be used with [draw] methods where it makes sense

do a proper loadbang for canvas fields (needs more testing)