Replace custom socket implementation with SignalR.

Replace MSAL and custom cookie auth with Microsoft.Identity.EntityFramework
Also some UI redesign to accommodate different login experience.

Shogi.Database/Session/Tables/Move.sql

@@ -1,11 +1,11 @@
 CREATE TABLE [session].[Move]
 (
-	[Id]				INT NOT NULL PRIMARY KEY IDENTITY,
-	[SessionId]			BIGINT NOT NULL,
-	[To]				VARCHAR(2) NOT NULL,
-	[From]				VARCHAR(2) NULL,
+	[Id]							INT NOT NULL PRIMARY KEY IDENTITY,
+	[SessionId]				[session].[SessionSurrogateKey]	NOT NULL,
+	[To]							VARCHAR(2) NOT NULL,
+	[From]						VARCHAR(2) NULL,
 	[PieceIdFromHand]	INT NULL,
-	[IsPromotion]		BIT DEFAULT 0
+	[IsPromotion]			BIT DEFAULT 0
 
 	CONSTRAINT [Cannot end where you start]
 		CHECK ([From] <> [To]),

Shogi.Database/Session/Tables/Session.sql

@@ -1,16 +1,8 @@
 CREATE TABLE [session].[Session]
 (
-	Id			BIGINT NOT NULL PRIMARY KEY IDENTITY,
-	[Name]		[session].[SessionName] UNIQUE,
-	Player1Id	BIGINT NOT NULL,
-	Player2Id	BIGINT NULL,
-	Created		DATETIMEOFFSET NOT NULL DEFAULT SYSDATETIMEOFFSET(),
-
-	CONSTRAINT FK_Player1_User FOREIGN KEY (Player1Id) REFERENCES [user].[User] (Id)
-		ON DELETE CASCADE
-		ON UPDATE CASCADE,
-
-	CONSTRAINT FK_Player2_User FOREIGN KEY (Player2Id) REFERENCES [user].[User] (Id)
-		ON DELETE NO ACTION
-		ON UPDATE NO ACTION
+	Id					[session].[SessionSurrogateKey] PRIMARY KEY,
+	Player1Id		[dbo].[AspNetUsersId] NOT NULL,
+	Player2Id		[dbo].[AspNetUsersId] NULL,
+	[CreatedDate]			DATETIMEOFFSET NOT NULL DEFAULT SYSDATETIMEOFFSET(), 
+  CONSTRAINT [CK_Session_LimitedNewSessions] CHECK ([session].MaxNewSessionsPerUser() < 4),
 )