Added a tool to check if all the pictures in graphics are used in int…

…ernal apps

firmware/tools/check_bitmap_usage.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+for fname in $(ls ../graphics/); do
+    fname=$(echo "$fname" | awk -F'.' '{print $1}')
+    out=$(grep -r --exclude="bitmap.hpp" "$fname" ../* )
+    ret=$?
+    if [[ "$ret" -ne 0 ]]; then
+        echo "$fname not found"
+    fi
+done
+