Handle XML files format properly

In A12 format of XML files changed to Android Binary XML
TWRP uses RapidXML to parse XMLs, but it don't support ABX format
So before parse check format of XML format and if it is in ABX, just ignore it for now

Change-Id: Ie40f5b3534db50143999984be22ade1d1af162e7
diff --git a/twrp-functions.hpp b/twrp-functions.hpp
index 77ca1a2..89311a2 100755
--- a/twrp-functions.hpp
+++ b/twrp-functions.hpp
@@ -129,6 +129,7 @@
 	static void List_Mounts(); // List current mounts by the kernel
 	static void Clear_Bootloader_Message(); // Removes the bootloader message from misc for next boot
 	static string Check_For_TwrpFolder(); // Gets user defined path on storage where backups should be stored
+	static bool Check_Xml_Format(const std::string filename); // Return whether a xml is in plain xml or ABX format
 	static void Copy_Log(string Source, string Destination);