Save targeted object for player

A lot of people have asked this along the years so as I was fiddling a bit with the GOMove script today, I decided to make this as well.

This small patch allows you to use .gob tar to target an object and then save it to your player as a target.

Then if you use .gob de without providing arguments, the object you selected with .gob tar will be deleted.

Atm you can use these commands:

.go gob

.gob turn

.gob delete

.gob activate

(basically all commands that dont have the possibility for extra arguments)