Created Update Addons Script

Created script to copy over addons from the submodules folder, to the
addons folder.

submodules/update_addons.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/bash
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+for dir in "$SCRIPT_DIR"/*; do
+  if [ -d "$dir" ]; then
+    echo Found $dir.
+    if [ -d "$dir/addons" ]; then
+      rsync -av $dir/addons $SCRIPT_DIR/../
+    fi
+  fi
+done
+
+echo "Submodule addons updated."