Add: GetString that returns std::string instead of filling a passed buffer

src/strings_func.h

@@ -172,6 +172,7 @@ public:
 extern StringParameters _global_string_params;
 
 char *GetString(char *buffr, StringID string, const char *last);
+std::string GetString(StringID string);
 char *GetStringWithArgs(char *buffr, StringID string, StringParameters *args, const char *last, uint case_index = 0, bool game_script = false);
 const char *GetStringPtr(StringID string);