iOS: fix app id in path, pen pressure filtering on Line

src/util.cpp

@@ -508,6 +508,22 @@ bool str_iequals(const std::string& a, const std::string& b)
     return true;
 }
 
+std::string str_replace(const std::string& string, const std::string& search, const std::string& replace)
+{
+    std::string ret = string;
+    // Get the first occurrence
+    size_t pos = ret.find(search);
+    // Repeat till end is reached
+    while(pos != std::string::npos)
+    {
+        // Replace this occurrence of Sub String
+        ret.replace(pos, search.size(), replace);
+        // Get the next occurrence from the current position
+        pos = ret.find(search, pos + replace.size());
+    }
+    return ret;
+}
+
 static const char* gl2str(GLenum err)
 {
     switch (err)
@@ -611,4 +627,4 @@ void parallel_for(unsigned nb_elements, std::function<void(int i)> functor, bool
     // Wait for the other thread to finish their task
     if (use_threads)
         std::for_each(my_threads.begin(), my_threads.end(), std::mem_fn(&std::thread::join));
-}
+}