Support request. Nested calls for ConvictionVoting pallet.

Hello! Our team is very happy to use the ledger application with Nova Wallet app and recently we delivered a new scope of features connected to ConvictionVoting pallet - twitter_link. To allow our Ledger users to continue to use the application, we ask for support for nested calls to the pallet. In order to make things work, we need nesting support for all calls from https://github.com/Zondax/ledger-kusama#convictionvoting

Some examples of our operations:

Delegate to all tracks: utility (batch_all)
Revoke from some tracks: utility (batch_all)

:link: zboto Link

Zondax / ledger-kusama

Support request. Nested calls for ConvictionVoting pallet. #192