[Lua] Resolve stoi Exception (#2736)

* [Lua] Resolve stoi Exception

* Change fallback for wp, not really needed for safety

* Change to Strings::ToInt

common/strings.cpp

@@ -763,3 +763,10 @@ std::string Strings::Random(size_t length)
 	std::generate_n(str.begin(), length, randchar);
 	return str;
 }
+
+// a wrapper for stoi which will return a fallback if the string
+// fails to cast to a number
+int Strings::ToInt(const std::string &s, int fallback)
+{
+	return Strings::IsNumber(s) ? std::stoi(s) : fallback;
+}

common/strings.h

@@ -86,6 +86,7 @@ class Strings {
 public:
 	static bool Contains(std::vector<std::string> container, std::string element);
 	static bool Contains(const std::string& subject, const std::string& search);
+	static int  ToInt(const std::string &s, int fallback = 0);
 	static bool IsNumber(const std::string &s);
 	static bool IsFloat(const std::string &s);
 	static const std::string ToLower(std::string s);