Triggers if the user has input the specified command.

Format: Command [oper] command_name

Arguments:

- [oper]: =, != (other operators not valid)
- command_name (string): Name of the command. Commands are defined in the player's CMD file, and are case-sensitive. If the CMD has multiple commands with the same name, then any one of those commands will work.

Return type: boolean (0 if false or 1 if true)

Error conditions: none

Example:

`trigger1 = Command = fireball_motion
; True if the user inputs the command corresponding to the command name fireball_motion.`