fixPermissions: simplify code, fix bugs

- avoid parsing permission strings
- fix memory leaks, a fix new/free mismatch and a compiler warning
- fix that only first updated-package was processed
- fix a potential stack overflow if packages.xml is huge
- minor refactoring for reducing duplicated code
- don't process packages without codePath
- fix path for deleting app data (currently unused anyway)
- fix file ownership on libs
- try not to mess up Android 5.0 app permissions

Patch set 4

- make fixing SELinux contexts an option with a check box
- add some notes / text to the themes

Patch set 6

- decouple "fix permissions" from "fix contexts"

Change-Id: Icc77ecc581befc5ce6e419b1f3b8ca189208c234

partitionmanager.cpp

@@ -1433,6 +1433,10 @@ int TWPartitionManager::Fix_Permissions(void) {
 
 	fixPermissions perms;
 	result = perms.fixPerms(true, false);
+#ifdef HAVE_SELINUX
+	if (result == 0 && DataManager::GetIntValue("tw_fixperms_restorecon") == 1)
+		result = perms.fixContexts();
+#endif
 	UnMount_Main_Partitions();
 	gui_print("Done.\n\n");
 	return result;