If the API is used before a command is called, the plugin crashes

[jasonw4331]

If the API is used before a command is called, the plugin crashes.

Essential variables for the API should not be defined for the first time by running a command as is bone here
https://github.com/Invy55/SimpleBanner/blob/master/src/Invy55/SimpleBanner/Main.php#L39-L43

Hard coded variables should be assigned to their variables on declaration to prevent crashes.

Currently, running $main->color() or $main->layer() without using the command first instantly crashes the server.