Implemented .linkonly (as an alternative to .imageonly). Updated pokaman with latest generations. Updated responses, fixed some warnings

src/NadekoBot/Migrations/Sqlite/20220727005807_linkonly-channels.cs

@@ -0,0 +1,26 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace NadekoBot.Migrations
+{
+    public partial class linkonlychannels : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "Type",
+                table: "ImageOnlyChannels",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: 0);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "Type",
+                table: "ImageOnlyChannels");
+        }
+    }
+}