Core: Include <string> explicitly when std::string is used.

Author: kaixiong

libvisual/libvisual/lv_actor.cpp

@@ -25,6 +25,7 @@
 #include "lv_common.h"
 #include "lv_plugin_registry.h"
 #include <stdexcept>
+#include <string>
 
 namespace LV {
 

libvisual/libvisual/lv_bin.cpp

@@ -24,6 +24,7 @@
 #include "config.h"
 #include "lv_bin.h"
 #include "lv_common.h"
+#include <string>
 
 namespace LV {
 

libvisual/libvisual/lv_input.cpp

@@ -26,6 +26,7 @@
 #include "lv_common.h"
 #include "lv_plugin_registry.h"
 #include <stdexcept>
+#include <string>
 
 namespace LV {
 

libvisual/libvisual/lv_morph.cpp

@@ -26,6 +26,7 @@
 #include "lv_plugin_registry.h"
 #include <algorithm>
 #include <stdexcept>
+#include <string>
 
 namespace LV {
 

libvisual/libvisual/lv_param.cpp

@@ -27,6 +27,7 @@
 #include <memory>
 #include <list>
 #include <stdexcept>
+#include <string>
 #include <cstdarg>
 
 namespace LV

libvisual/libvisual/lv_plugin_registry.h

@@ -8,6 +8,7 @@
 
 #include <libvisual/lv_singleton.hpp>
 #include <libvisual/lv_plugin.h>
+#include <string>
 #include <string_view>
 #include <memory>