attempt to fix the "drag" event for [draw], and make it more robust. But it still needs to be tested to make sure it interacts properly with all the other events.

*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

(but patches which already have multiple arrays in a graph will continue to work)

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

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