.sad, .smch now persist restarts. .usmch added to unset music channel, since destroying a player won't reset it, Added --start-delay option for .race command

NadekoBot.Core/Migrations/20171126024327_persist-sad-and-musicchannel.cs

@@ -0,0 +1,46 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+using System;
+using System.Collections.Generic;
+
+namespace NadekoBot.Migrations
+{
+    public partial class persistsadandmusicchannel : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "MusicSettings",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "INTEGER", nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    DateAdded = table.Column<DateTime>(type: "TEXT", nullable: true),
+                    GuildConfigId = table.Column<int>(type: "INTEGER", nullable: false),
+                    MusicChannelId = table.Column<ulong>(type: "INTEGER", nullable: true),
+                    SongAutoDelete = table.Column<bool>(type: "INTEGER", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_MusicSettings", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_MusicSettings_GuildConfigs_GuildConfigId",
+                        column: x => x.GuildConfigId,
+                        principalTable: "GuildConfigs",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_MusicSettings_GuildConfigId",
+                table: "MusicSettings",
+                column: "GuildConfigId",
+                unique: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "MusicSettings");
+        }
+    }
+}