Clear hotkeys on removal, unlock blueprints, show save info, add Changed only filter

index.html

@@ -70,6 +70,10 @@
       <input type="checkbox" id="ownedOnly">
       <span>Owned only</span>
     </label>
+    <label class="check">
+      <input type="checkbox" id="changedOnly">
+      <span>Changed only</span>
+    </label>
     <span class="count-label" id="resultCount"></span>
   </section>