Option to reset list variables as eVars

Background: 

1. List variables are like eVas persistent by nature

2. There is only 3  of list variables avalable per report suite

3. There are growing numebr of use cases for list variables and they need to be reused more & more often

Issue:

When list varialbels are re-used the old values are being passed into new reports

Requirement /:

There is a need to enable RESET values option for list variables that would allow to delete all previous values stored in the cookies associated with the variables. 

This functinality is currently available for all eVars.

Can it please be gtransffered to the list variables as well