feature: better buy/sell command

[Tolfx]

Is your feature request related to a problem? Please describe.
Newer bots currently have new buy commands which goes: buy_item or sell_item which makes it easier to just double click and paste for easy use.

Describe the feature you'd like
Implement same function and use it as a module.

[MaxurDev]

You can already change the buy and sell commands in the options.json file I believe here

But if you mean by adding a new command for changing it without having to manually do it, then I think it could still be something to be implemented into the bot.