Add Grapher to the apps list #51
                
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Grapher (website: https://grapherx.netlify.app/ , repo: https://codeberg.org/nilesh/grapher ) now allows exporting files in the .canvas format. I have tested this by re-importing the file with hi-canvas.
Parent-child relationship between nodes gets lost as the jsoncanvas spec is not currently clear about how grouping or nesting is to be represented.