Edited the views so application looks consistant

-edited appointment, adoption, product, inventory xmls to look consistant
- added search feature to Pets, services, and suppliers
- made it so the application will resume where you left off when the application is switched to the background and back

app/src/main/res/values-night/themes.xml

@@ -5,5 +5,7 @@
         <item name="colorPrimaryVariant">@color/primary_medium</item>
         <item name="colorAccent">@color/accent_coral</item>
         <item name="android:windowBackground">@color/background_grey</item>
+        <item name="editTextStyle">@style/Widget.App.EditText</item>
+        <item name="spinnerStyle">@style/Widget.App.Spinner</item>
     </style>
 </resources>