Add ozip decryption for Oppo/Realme device

This function will automatically decrypt .ozip file in a .zip and it will
save the .zip in the same folder of the .ozip and with the same name.
After the decryption, the flash will start.

To enable this function you have to set a Boardconfig flag with the
decryption key like i did here:

https://github.com/mauronofrio/android_device_realme_RMX1901/commit/a30625f80a31b9b85e4948fc9f9beeb61d5bcb8a

Original projects:
https://github.com/sabpprook/ozip2zip
https://github.com/bkerler/oppo_ozip_decrypt

Change-Id: Ic93243a565008c442bcf2992069b2801532ac7c1
(cherry picked from commit 0ff59845f2f8dddedb4cee9a9faf86a6294cce66)
diff --git a/gui/objects.hpp b/gui/objects.hpp
index 3f72418..24e9d24 100644
--- a/gui/objects.hpp
+++ b/gui/objects.hpp
@@ -288,6 +288,7 @@
 	ThreadType getThreadType(const Action& action);
 	void simulate_progress_bar(void);
 	int flash_zip(std::string filename, int* wipe_cache);
+	int ozip_decrypt(std::string zip_path);
 	void reinject_after_flash();
 	void operation_start(const string operation_name);
 	void operation_end(const int operation_status);