add hemtt support, major refactor

- no longer supports server events
- can now more easily build using hemtt
- extension vastly improved in both structure and functionality
- tested on listen server
- includes schema change

addons/main/functions/fn_timestamp.sqf

@@ -0,0 +1,24 @@
+// (parseSimpleArray ("AttendanceTracker" callExtension "getTimestamp")) select 0;
+
+// const time.RFC3339 untyped string = "2006-01-02T15:04:05Z07:00"
+
+systemTimeUTC apply {if (_x < 10) then {"0" + str _x} else {str _x}} params [
+	"_year",
+	"_month",
+	"_day",
+	"_hour",
+	"_minute",
+	"_second",
+	"_millisecond"
+];
+
+format[
+	"%1-%2-%3T%4:%5:%6Z",
+	_year,
+	_month,
+	_day,
+	_hour,
+	_minute,
+	_second	
+];
+