Remove the need to register slash commands separately

We modified the slash command interface to allow getting command data, and created a generic implementation of it that automatically retrieves data from the command data. The interface should not be used now. Instead, extending the implementation is preferred as it provides a semi-working command already.

src/main/java/wtf/beatrice/hidekobot/commands/slash/DieCommand.java

@@ -1,20 +1,23 @@
 package wtf.beatrice.hidekobot.commands.slash;
 
 import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.interactions.commands.DefaultMemberPermissions;
+import net.dv8tion.jda.api.interactions.commands.build.CommandData;
+import net.dv8tion.jda.api.interactions.commands.build.Commands;
 import org.jetbrains.annotations.NotNull;
 import wtf.beatrice.hidekobot.Cache;
 import wtf.beatrice.hidekobot.HidekoBot;
-import wtf.beatrice.hidekobot.objects.SlashCommand;
+import wtf.beatrice.hidekobot.objects.SlashCommandImpl;
 
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 
-public class DieCommand implements SlashCommand
+public class DieCommand extends SlashCommandImpl
 {
-
     @Override
-    public String getCommandName() {
-        return "die";
+    public CommandData getSlashCommandData() {
+        return Commands.slash("die", "Stop the bot's process.")
+                .setDefaultPermissions(DefaultMemberPermissions.DISABLED);
     }
 
     @Override