add new feature to permissioned voting template to hide votes and results until end period is not reached

[zamrokk]

See how to implement a chest here :

https://github.com/smart-chain-fr/Ligolib/blob/generic-fa2/shifumi/src/cameligo/contracts/session.mligo

[zamrokk]

wait for chest to come on next releases

Not sure it is a huge improvement but , ok why not ?

Priority on the anonymous votes