Add necessary headers for no-PCH build

#516

Author: Foereaper

ElunaConfig.cpp

@@ -11,6 +11,10 @@
 #endif
 #include "ElunaConfig.h"
 
+#include <sstream>
+#include <algorithm>
+#include <cctype>
+
 ElunaConfig::ElunaConfig()
 {
 }