Several MagiskHide improvements

- Directly get UID instead of traversing /data/data everytime
- Use /data/user_de/0 instead of /data/data on Android 7.0+
- Update hide_uid set incrementally when adding/initializing targets
- Guard hide_uid set with the same lock as hide_list vector
- Do not add GMS package into database; only add to in-memory list

native/jni/utils/file.cpp

@@ -385,7 +385,7 @@ void write_zero(int fd, size_t size) {
 }
 
 vector<string> file_to_vector(const char *filename) {
-	auto arr = vector<string>();
+	vector<string> arr;
 	if (access(filename, R_OK) != 0)
 		return arr;
 	char *line = nullptr;