Make slash commands interface and load them dynamically

Slash commands are now loaded dynamically by implementing a SlashCommand interface and storing them in a loaded commands map.

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

@@ -4,10 +4,17 @@ import net.dv8tion.jda.api.EmbedBuilder;
 import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
 import org.jetbrains.annotations.NotNull;
 import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.objects.SlashCommand;
 
-public class HelpCommand
+public class HelpCommand implements SlashCommand
 {
 
+    @Override
+    public String getCommandName() {
+        return "help";
+    }
+
+    @Override
     public void runSlashCommand(@NotNull SlashCommandInteractionEvent event)
     {
         // defer reply because replying might take a while