wallet-refresh,deps update,fmt

[victor-tucci]

• Add non-blocking isRefreshing() and Add locks around the refresh thread.
• isStake() function added for wallet-api.
• Removed Openssl.
• Removed UPnP support.
• Removed Openssl,Unbound,Expact.
• Added new fmt::format and fmt submodule.
• Modified print_locked_stakes output.
• Prevent stake unlocks for small holdings.
• Fix negative coinbase emissions.
• Minor bug fix in minor_reward.
• This updates get_master_nodes to always include current info (rather than latest proof info) for itself when querying a master node.
• Added fail message if tx_blob is empty.