add Image::as_app_icon to allow ergonomically setting the window icon
          #928
        
          
      
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This PR adds the function
Image::as_app_icon, which can be used to construct aminiquad::conf::Iconfor use in aConf. Previously, there was no practical way to do this, except to manually useinclude_bytes!and have three differently scaled versions. (best example of this: https://github.com/not-fl3/miniquad/blob/master/src/default_icon.rs)The PR also includes a small example that shows it is working as intended.
Note that this is built on top of #927.