fix warnings (#648)

* fix unknown command line argument

* fix warnings settings for gcc

* fix -Wzero-as-null-pointer-constant

* revert CMakeLists.txt

src/logic/scripting/lua/libs/libtoml.cpp

@@ -23,5 +23,5 @@ static int l_toml_parse(lua::State* L) {
 const luaL_Reg tomllib[] = {
     {"tostring", lua::wrap<l_toml_stringify>},
     {"parse", lua::wrap<l_toml_parse>},
-    {NULL, NULL}
+    {nullptr, nullptr}
 };