cleanup iemgui dialog form names, replacing dashes with underscores. Fix stray bugs in canvas dialog, and clean up css selector names

Reset the last search term after closing the canvas find dialog so that the next search restarts from the beginning again.

fix #172: Use border styles for the iemgui label anchors, and the gop_rectangle color for the gop move anchor

change from checking OS to checking nw version for the zoom_kludge (This way the OSX 10.8 binary can use lts 0.14.7 and get the kludge)

stop using "x" for sending iemgui colors-- while it has a precision formatter, it doesn't have a maximum size formatter (and it can't because 64-bit archs need the larger values)