[CSM] Add get_node and get_node_or_nil

src/script/lua_api/l_client.h

@@ -47,6 +47,14 @@ class ModApiClient: public ModApiBase
 	// set_last_run_mod(modname)
 	static int l_set_last_run_mod(lua_State *L);
 
+	// get_node(pos)
+	static int l_get_node(lua_State *L);
+
+	// get_node_or_nil(pos)
+	static int l_get_node_or_nil(lua_State *L);
+
+
+
 public:
 	static void Initialize(lua_State *L, int top);
 };