[Feature] Add Strings::BeginsWith() and Strings::EndsWith() (#3471)

* [Strings] Add Strings::BeginsWith() and Strings::EndsWith()

# Notes
- These are useful so that we don't have to manually calculate size or perform a substring.

* Update questmgr.cpp

* Update client.cpp

common/strings.cpp

@@ -695,8 +695,31 @@ std::string Strings::ConvertToDigit(int n, const std::string& suffix)
 		return NUM_TO_ENGLISH_X[n] + suffix;
 	}
 }
+
+bool Strings::BeginsWith(const std::string& subject, const std::string& search)
+{
+	if (subject.length() < search.length()) {
+		return false;
+	}
+
+	return subject.starts_with(search);
+}
+
+bool Strings::EndsWith(const std::string& subject, const std::string& search)
+{
+	if (subject.length() < search.length()) {
+		return false;
+	}
+
+	return subject.ends_with(search);
+}
+
 bool Strings::Contains(const std::string& subject, const std::string& search)
 {
+	if (subject.length() < search.length()) {
+		return false;
+	}
+
 	return subject.find(search) != std::string::npos;
 }