Improve backup & wipe exclusion handling

Rename twrpDU.* to exclude.*
Remove global variable for du and replace with partition specific
variables.
Use separate exclusion lists for backups and wiping.
Clean up some includes
Fix some parenthesis in twrp.cpp that I messed up.

Note: twrpTarMain command line utility compiles but probably does
not work correctly yet due to not properly setting part_settings

Change-Id: Idec9c3e6a8782ba53f3420fa79ba33394f4f85fb
diff --git a/gui/object.cpp b/gui/object.cpp
index 14df14f..e7d1bf9 100644
--- a/gui/object.cpp
+++ b/gui/object.cpp
@@ -2,7 +2,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-
+#include <sys/stat.h>
 #include <string>
 
 extern "C" {