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/SayCommand.java

@@ -1,18 +1,28 @@
 package wtf.beatrice.hidekobot.commands.slash;
 
+import net.dv8tion.jda.api.Permission;
 import net.dv8tion.jda.api.entities.channel.middleman.MessageChannel;
 import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.interactions.commands.DefaultMemberPermissions;
 import net.dv8tion.jda.api.interactions.commands.OptionMapping;
+import net.dv8tion.jda.api.interactions.commands.OptionType;
+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.objects.SlashCommand;
+import wtf.beatrice.hidekobot.objects.SlashCommandImpl;
 
-public class SayCommand implements SlashCommand
+public class SayCommand extends SlashCommandImpl
 {
-
-
     @Override
-    public String getCommandName() {
-        return "say";
+    public CommandData getSlashCommandData()
+    {
+
+        return Commands.slash("say", "Make the bot say something.")
+                .addOption(OptionType.STRING, "text",
+                        "The message to send.",
+                        true,
+                        false)
+                .setDefaultPermissions(DefaultMemberPermissions.enabledFor(Permission.MESSAGE_MANAGE));
     }
 
     @Override