[Tasks] Schema simplification (#2449)

* Combine task_activity item and npc fields

This will make tooling easier.

While denormalizing goallists may not be ideal, it decouples tasks from
rewards which share the table and removes a redundant column in favor
of a using the delimited string which better matches live packet data.

* [Tasks] Deprecate goallists table, migrate reward goal lists, simplify logic

* Update 2022_09_25_task_concat_matchlists.sql

* Update 2022_09_25_task_concat_matchlists.sql

* Tweaks

* Fix reward column name in conversion script

* Task reward stacking

* Update task_client_state.cpp

* Implement stack counts

* Fix reward item instance memory leak

* Validate reward item instance

* Fix item reward message

* Fix findtask

Co-authored-by: Akkadius <akkadius1@gmail.com>

common/strings.cpp

@@ -64,7 +64,7 @@ std::vector<std::string> Strings::Split(const std::string &str, const char delim
 }
 
 // this one takes delimiter length into consideration
-std::vector<std::string> Strings::Split(std::string s, std::string delimiter)
+std::vector<std::string> Strings::Split(const std::string& s, const std::string& delimiter)
 {
 	size_t                   pos_start = 0, pos_end, delim_len = delimiter.length();
 	std::string              token;
@@ -674,3 +674,7 @@ std::string Strings::ConvertToDigit(int n, std::string suffix)
 		return NUM_TO_ENGLISH_X[n] + suffix;
 	}
 }
+bool Strings::Contains(const std::string& subject, const std::string& search)
+{
+	return subject.find(search) != std::string::npos;
+}