IconSVG and SVGPath Widget

[PaulMcClernan]

Thanks to the SVG Glyphs browser stack, I noticed that the included FontAwesome YouTube icon is not correct, likely because a styled text was converted to outline when the specified font was not available. So just need to replace the SVG path string in the IconSVG library.

Also, the SVG Incon (SVGPath) widget which is used for displaying IconSVG paths, has undocumented mouse handlers (mouseDown, double down, mouseWithIn, etc.) and no default script (default handlers), so this would be more instantly useful if it included those things (without renaming anything so as to not break existing stacks).