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

.gitignore

@@ -8,3 +8,10 @@ config.json
 /extension/@AttendanceTracker/
 
 \@AttendanceTracker.7z
+*.pbo
+.hemttout
+hemtt
+hemtt.exe
+*.biprivatekey
+
+*.bk