Added alternate file to load symbols from (instead of the debugee executable).

tests/hellosymbolfile/function1.cpp

@@ -0,0 +1,15 @@
+#include "function1.h"
+#include <iostream>
+#include <unistd.h>
+
+void function1 (const std::string& text) {
+
+    int i = 42;
+
+    sleep(2); // Simulate doing work.
+
+    std::cout << text << i << std::endl;
+
+    sleep(3); // Simulate doing work.
+}
+