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

gui/pages.cpp

@@ -32,6 +32,7 @@
 #include <time.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <dirent.h>
 #include "../twrp-functions.hpp"
 #include "../partitions.hpp"