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

debuild update: update to nw.js 0.15.4, remove DejaVu font from package for which we have a dependency anyway.

first shot at setting up the correct libs for Gem (have to put them in build/bin so that the dynamic loader finds them)

quick fix for backslashes in legacy tcl commands breaking the GUI parser-- just send "dummy" command arg