Starting the console from a GUI application is not working very
well - so let's just provide a 2nd executable for the CLI. It
will be a simple console application that merely invokes the main
application passing all standard I/O. Unfortunately this does not
mean the existing hacks can be removed. Without them the wrapper
still doesn't get any I/O from the GUI application.
* Remove PNG_ICON_CROP
* Not sure how that was supposed to be useful because even for projects
without PNG_ICON_NO_CROP it does not make much sense
* Test multiple sizes to determine the PNG path automatically
* Locate PNG in basic config so the path is also automatically determined
for the macOS bundle as well
* Log status message when ffmpeg/png2icns are not available
* Format CMake code more nicely
Rely on generator expressions to get the correct filename. This has never
worked because WINDOWS_EXT was usually only set after WindowsResources has
been included.
Martchus