chuni: added SUN support, matchmaking, fixed bugs, added docs

- Added CHUNITHM SUN support
- Added first matchmaking support with CPU spawning and messages
- Fixed wrong `next_idx` calculations
- Added `startDate` to events to spawn the correct items
- Fixed login bonus per version
- Added information to docs

titles/chuni/schema/score.py

@@ -134,7 +134,9 @@ playlog = Table(
     Column("charaIllustId", Integer),
     Column("romVersion", String(255)),
     Column("judgeHeaven", Integer),
-    mysql_charset="utf8mb4",
+    Column("regionId", Integer),
+    Column("machineType", Integer),
+    mysql_charset="utf8mb4"
 )