[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

zone/questmgr.cpp

@@ -1018,8 +1018,8 @@ bool QuestManager::isdisctome(uint32 item_id) {
 	const std::string item_name = item->Name;
 
 	if (
-		strcmp(item_name.substr(0, 5).c_str(), "Tome ") &&
-		strcmp(item_name.substr(0, 7).c_str(), "Skill: ")
+		!Strings::BeginsWith(item_name, "Tome of ") &&
+		!Strings::BeginsWith(item_name, "Skill: ")
 	) {
 		return false;
 	}