server: started ShardServer

- protocol: added GenSerialKey() which securely generates an EnterSerialKey
- login server accepts a shard via LoginServer.AddShard()
- login server will pass LoginMetaData to the selected shard via ShardServer.QueueLogin()
- misc. refactoring

db/players.go

@@ -39,15 +39,14 @@ type Player struct {
 	SkywayLocationFlag []byte
 	FirstUseFlag       []byte
 	Quests             []byte
-	/* Appearance tbl */
-	Body      int `db:"Body"`
-	EyeColor  int `db:"EyeColor"`
-	FaceStyle int `db:"FaceStyle"`
-	Gender    int `db:"Gender"`
-	HairColor int `db:"HairColor"`
-	HairStyle int `db:"HairStyle"`
-	Height    int `db:"Height"`
-	SkinColor int `db:"SkinColor"`
+	Body               int /* Appearance tbl start */
+	EyeColor           int
+	FaceStyle          int
+	Gender             int
+	HairColor          int
+	HairStyle          int
+	Height             int
+	SkinColor          int /* Appearance tbl end */
 }
 
 // returns PlayerID, error

db/schema.go

@@ -20,10 +20,6 @@ type DBHandler struct {
 //go:embed migrations/new.sql
 var createDBQuery string
 
-var (
-	DefaultDB *DBHandler
-)
-
 func OpenLiteDB(dbPath string) (*DBHandler, error) {
 	sqliteFmt := fmt.Sprintf("%s", dbPath)