* New option per vorebelly that silicons may use to choose between overlay type
* If picking sleeper, it works as it currently did.
* If picking vorebelly, it gives them sleeper/analyzer/etc belly overlay if their belly's contents are >= 1
* Consequently adds a new belly_obj var to track this
* Adds user.updateicon() call to perform_the_nom() to trigger belly overlay update
* Edits robot_vr's updateicon() to contain logic for sleeper vs vorebelly pref
* For now uses sleeper_r overlay since it exists for ALL icon_states
* Ideally either me or someone I enslave creates sleeper_o overlay using orange colours where relevant. However, rather not delay implementation for this
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