Add tool for converting an SVG file into a multiple-resolution Windows icon

[KeyWorksRW]

Description:

A common method of setting and Icon for a Windows executable is to set the APPICON in the resource file. Unfortunately, you can't supply a SVG file for this icon. It would be handy if wxUiEditor had a tool that would take an SVG file and convert it to a Windows icon using 16x16, 32x32, 48x48 and 256x256. Besides being useful for wxUiEditor itself, it could potentially be useful for anyone else wanting to use an SVG file for the application's icons.