Added View.java for '/ggm view' argument handling
Fixed argument error message
Fixed argument error messages
Added List.java for '/ggm list' argument handling
Added String 'usage' for argument usage
Added String 'usage' for argument usage

+ Altered argument scheme: <> for static option input and [] for
variable input
+ Fixed capitalization for argument error messages
Moved all arguments into respective classes

All that's left now is testing everything.