* cli: add --enable-close flag to create-token which sets its close authority to mint authority
* cli: add support to changing a mint close authority to authorize
* cli: add close-mint, a new command for closing a mint
* cli: update authorize and close-account to go through the token client
* client: change set_authority and close_account to support multisigners
Jon Cinque
hanako mumei
Tyera Eulberg