[Request][Suggestion] New CLI command 'mintsparkfrom'

[eternal-hunger]

Hello team,

The current CLI version supports mint Spark from transparent address but we are missing something:

• Input cannot be selected
• Cannot deduct fee (To completely clear the transparent balance)

With Firo-QT UI we can achieve this, but in CLI/server environment, it is impossible.
Please take a review on this suggestion, thank you all!

mintsparkfrom "fromaddress" {"address":{amount,subtractfee...}, "address":{amount,memo,subtractfee...}}

Mint Spark from an address.
Requires wallet passphrase to be set with walletpassphrase call.

Arguments:
1. "fromaddress"           (string, required) The transparent address to mint funds from.
2.  {
      "address":amount     (numeric or string) The Spark address is the key, the numeric amount (can be string) in FIRO is the value
      ,...
    }