[Request] Send message when String or Component is returned from command logic

Examples:
```lua
script:registerCommand(function(sender, args)
    ...
    if (ConsoleCommandSender.class:isInstance(sender) == true) then
        return "<red>Command must not be run by console."
    end
    ...
end, {
    name = "example"
})
```
Empty / blank messages should probably be skipped.