updated app and document (.pde) icon png files

app/src/processing/app/ui/Toolkit.java

@@ -714,7 +714,7 @@ public class Toolkit {
         iconImages = new ArrayList<>();
         final int[] sizes = { 16, 32, 48, 64, 128, 256, 512 };
         for (int sz : sizes) {
-          iconImages.add(Toolkit.getLibImage("icons/pde-" + sz + ".png"));
+          iconImages.add(Toolkit.getLibImage("icons/app-" + sz + ".png"));
         }
       }
       window.setIconImages(iconImages);

build/linux/processing.desktop

@@ -1,9 +1,9 @@
 [Desktop Entry]
-Version=@version@ 
-Name=Processing 
+Version=@version@
+Name=Processing
 Comment=Software sketchbook
 Exec=processing %F
-Icon=/opt/processing/lib/icons/pde-256.png
+Icon=/opt/processing/lib/icons/app-256.png
 Terminal=false
 Type=Application
 Categories=Development;AudioVideo;Video;Graphics;Developer;