Create a TWRP Disk Usage Class to retain state about a directory and whether we should skip it in other classes like twrpTar.
Moved Get_Folder_Size to this new class.

Change-Id: If0a0220f900eb109581f2eeaf7b76e3f7d6886f1
diff --git a/twrpTar.hpp b/twrpTar.hpp
index 9128ba0..fa3d2ce 100644
--- a/twrpTar.hpp
+++ b/twrpTar.hpp
@@ -27,6 +27,7 @@
 #include <fstream>
 #include <string>
 #include <vector>
+#include "twrpDU.hpp"
 
 using namespace std;