Allow building of an OEM friendly TWRP

Disable theming
Disable creating the TWRP folder for the settings file
Change factory reset on data/media devices to a full wipe

Change-Id: I3104282b5dd3f55dfff7c8cf39c72750af08563d

partition.cpp

@@ -1312,7 +1312,9 @@ bool TWPartition::Wipe_Encryption() {
 		if (Has_Data_Media && !Symlink_Mount_Point.empty()) {
 			Recreate_Media_Folder();
 		}
+#ifndef TW_OEM_BUILD
 		gui_print("You may need to reboot recovery to be able to use /data again.\n");
+#endif
 		return true;
 	} else {
 		Has_Data_Media = Save_Data_Media;
@@ -1556,6 +1558,10 @@ bool TWPartition::Wipe_F2FS() {
 }
 
 bool TWPartition::Wipe_Data_Without_Wiping_Media() {
+#ifdef TW_OEM_BUILD
+	// In an OEM Build we want to do a full format
+	return Wipe_Encryption();
+#else
 	string dir;
 	#ifdef HAVE_SELINUX
 	fixPermissions perms;
@@ -1599,6 +1605,7 @@ bool TWPartition::Wipe_Data_Without_Wiping_Media() {
 	}
 	gui_print("Dirent failed to open /data, error!\n");
 	return false;
+#endif // ifdef TW_OEM_BUILD
 }
 
 bool TWPartition::Backup_Tar(string backup_folder) {