Commands reject invalid sub-commands

[dcarpenter31]

Description

Added a validateCommands() method that is called for each command except for the help command, since its behavior is a little diffrent than the other commands. Also changed the help command a little bit to have a clearer error message when the user enters a command that has not yet been added.

closes #98

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[elenirotsides]

Was Trivia Bot doing something other than Invalid command named: <command name> in response to a nonexistent command? I think your edit here does the same thing as before, but please correct me if I'm wrong! I like the edit on the bot message though, it makes it a little clearer to the user!

[dcarpenter31]

yeah, I did not edit the help command much, just changed the parameters to read all of the commands as arguments and edited the message to be a little clearer

Here's the code on main rn for this section:

if (command) {
            const cmd = this.client.commands.get(command) || this.client.commands.get(this.client.aliases.get(command));

            if (!cmd) return message.channel.send(`Invalid Command named: \`${command}\``);

            embed.setAuthor(`Command Help: ${command}`, message.guild === null ? null : message.guild.iconURL({ dynamic: true }));

[elenirotsides]

Looks great, thanks for the awesome PR!