minor layout fixes, replace non breakable spaces if found in an encrypted armored message, as they break the decryption, the HTML representation of GMail introduces them for empty lines ending in a normal space, also adjusted the PGP_MESSAGE regex to allow for spaces after the -----, which seems to be added by some implementations

res/layout/mailbox_message_item.xml

@@ -29,7 +29,7 @@
     android:src="@drawable/encrypted"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    android:layout_centerVertical="true"/>
+    android:layout_gravity="center_vertical"/>
 
 <LinearLayout
     android:orientation="vertical"