Add _binoculars variable to assignGear

[darkChozo]

I swear this is already an issue, but the binocular classname should be a variable in the main assignGear files, not hardcoded per class like it is now. It would make it much easier to swap out rangefinders for regular binoculars or even laser designators, and is just consistent with how basically everything else in assignGear is set up.

[shadow-fa]

See ferstaberinde#783