Add image mounting commands for OBB files

Allow the mounting of OBB filesystem images if they're encrypted with
twofish and in FAT filesystem format.

Change-Id: I54804e598f46b1f3a784ffe517ebd9d7626de7aa
diff --git a/Volume.cpp b/Volume.cpp
index 2f3cad5..f43d375 100644
--- a/Volume.cpp
+++ b/Volume.cpp
@@ -73,6 +73,11 @@
  */
 const char *Volume::ASECDIR           = "/mnt/asec";
 
+/*
+ * Path to where loop devices are mounted
+ */
+const char *Volume::LOOPDIR           = "/mnt/loop";
+
 static const char *stateToStr(int state) {
     if (state == Volume::State_Init)
         return "Initializing";