Implemented bare-bones character system API

I need to devise a way to update the clients about changes to their
characters directly from the lua scripts. This isn't too important per se,
but the pattern will be important for the monster and trigger systems.

server/characters/character_manager.cpp

@@ -193,6 +193,7 @@ void CharacterManager::Unload(int uid) {
 }
 
 void CharacterManager::Delete(int uid) {
+	//TODO: when deleting a character, move it to an archive table
 	//delete this character from the database, then remove it from memory
 	sqlite3_stmt* statement = nullptr;
 
@@ -252,6 +253,15 @@ CharacterData* CharacterManager::Get(int uid) {
 	return &it->second;
 }
 
+CharacterData* CharacterManager::Get(std::string handle) {
+	for (std::map<int, CharacterData>::iterator it = elementMap.begin(); it != elementMap.end(); ++it) {
+		if (it->second.GetHandle() == handle) {
+			return &it->second;
+		}
+	}
+	return nullptr;
+}
+
 int CharacterManager::GetLoadedCount() {
 	return elementMap.size();
 }