Convert emoji images to png format

src/freedombone-app-pleroma

         return
     fi
 
+    if [[ "$image_url" == *'.jpg' || "$image_url" == *'.jpeg' || "$image_url" == *'.gif' ]]; then
+        convert $image_filename $PLEROMA_DIR/custom_emoji/${shortcode}.png
+        if [ ! -f $PLEROMA_DIR/custom_emoji/${shortcode}.png ]; then
+            dialog --title $"Add Custom Emoji" \
+                   --msgbox $"Unable to convert empji image to png format" 6 60
+            return
+        fi
+        image_extension='png'
+        image_filename=$PLEROMA_DIR/custom_emoji/${shortcode}.${image_extension}
+    fi
+
     if ! grep -q "${shortcode}," $image_filename; then
         echo "${shortcode}, ${image_filename}" >> $PLEROMA_DIR/config/emoji.txt
     else
         ONION_ONLY='no'
     fi
 
+    apt-get -yq install wget imagemagick
+
     # We need elixir 1.4+ here, so the debian repo package won't do
     install_elixir