Add ability to add arguments to command shortcut

[TimothyL96]

Assuming: Command: /t Output: fmt.Println( "test" )

Add ability for user to enter commands with arguments like /t{1:123} where {1} is just an example of the argument, and user set the output to: fmt.Println( "test {1}" )

and the output could read the argument and output it together to: fmt.Println( "test 123" )