Added .banprune command which sets how many days worth of messages will be pruned when bot (soft)bans a person either through a command or another punishment feature. Also updated .next usage string.

src/NadekoBot/Migrations/Sqlite/20220831142504_banprune.cs

@@ -0,0 +1,25 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace NadekoBot.Migrations
+{
+    public partial class banprune : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "PruneDays",
+                table: "BanTemplates",
+                type: "INTEGER",
+                nullable: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "PruneDays",
+                table: "BanTemplates");
+        }
+    }
+}

src/NadekoBot/Migrations/Sqlite/NadekoSqliteContextModelSnapshot.cs

@@ -529,6 +529,9 @@ namespace NadekoBot.Migrations
                     b.Property<ulong>("GuildId")
                         .HasColumnType("INTEGER");
 
+                    b.Property<int?>("PruneDays")
+                        .HasColumnType("INTEGER");
+
                     b.Property<string>("Text")
                         .HasColumnType("TEXT");