fix awful regression where deleting the end of a comment, a message, or the trailing arguments of an object didn't actually change the state of the object in Pd.

replacing literal "+" must come first

grabbed it from http://puredata.info/downloads/jmmmp/releases/0.46

remove one of the tutorial files that has a filename which causes problems under Windows (with the OS itself, outside of any of Pd's implementation details)

Cosmetic GUI changes: Reduce label font size in dialogs, enlarge prefs dialog window to fix bad line breaks in prefs dialog.

add my_canvas_class conditional in g_editor.c to disallow resize anchor, since it abuses an extra label handle for resizing.

brought back the changes to Scope.c made before using the miXed submodule, plus some changes to get some objects to build correctly on OSX and Windows

This appears to be some complex bug with the @font-face rule in Chromium. The only surefire workaround I've found so far is to base64-encode the font and include it in a css file.

* check canvas visibility in iemgui_displace
* check visibility before updating scroll in canvas_dofont