Move to class-based command handling

Having everything in a single class is bad practice, so different classes for each command were made.

src/main/java/wtf/beatrice/hidekobot/slashcommands/DieCommand.java

@@ -0,0 +1,24 @@
+package wtf.beatrice.hidekobot.slashcommands;
+
+import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import org.jetbrains.annotations.NotNull;
+import wtf.beatrice.hidekobot.Configuration;
+import wtf.beatrice.hidekobot.HidekoBot;
+
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+public class DieCommand
+{
+
+    public DieCommand(@NotNull SlashCommandInteractionEvent event)
+    {
+        if(Configuration.getBotOwnerId() != event.getMember().getIdLong())
+        {
+            event.reply("Sorry, only the bot owner can run this command!").setEphemeral(true).queue();
+        } else {
+            event.reply("Going to sleep! Cya :sparkles:").queue();
+            Executors.newSingleThreadScheduledExecutor().schedule(HidekoBot::shutdown, 3, TimeUnit.SECONDS);
+        }
+    }
+}