IOStream can now be open on a file and write into it.

JulietShaderCompiler/main.cpp

@@ -45,5 +45,9 @@ void Compile()
 int main(int argc, char* argv[])
 {
     auto*  stream = IOFromFile(ConstString("XF"), ConstString("w"));
+
+    IOPrintf(stream, ":)");
+    IOPrintf(stream, "%d%s", 1234, "Hello World!");
+
     return 0;
 }