Make the cli tool work with the last librustzcash + cargo fmt

[oxarbitrage]

I did some updates to the lib code in this tool so it can be built. I am not sure if all the changes are correct as there are other things also failing, however it seems to be working:

Building:

git clone https://github.com/oxarbitrage/zecpaperwallet
cd zecpaperwallet
git checkout -t origin/upgrade-librustzcash
cd cli
cargo build --release

Running:

$ ./target/release/zecpaperwallet -z 1 -t 1
Provide additional entropy for generating random numbers. Type in a string of random characters, press [ENTER] when done
kfdskfsdkjfjsdfkjsdkjfsd
Generating 1 Sapling addresses and 1 Transparent addresses...[OK]
[
  {
    "num": 0,
    "address": "zs13e3fkfmpctxt55hx8hz5v02c6elsfe87cwxgt45q05uqrfs9l9jsf7fm4xcujcfkj02us4u2j0g",
    "private_key": "secret-extended-key-main1qdct6nh5qqqqpq95zg3kr40dtv4p08399zdyqqv8dea2sflm3h0p6cxyafxrkshdmy9vkpecp8yw7pnnwv0eng80dsujk7xdyeks3sz0lyh9tdu3xwdq65j3szvjxk739l94hxuexkc7jch5kknndcd2smw4nwhxycu33xsv0pmdt390e3sdmlm4ga3dslhtavumy9wt99k6xnnwckthzty9lwy4tep68q6ykp0hh2nnz5ucsc4qf54885ujj8c0xlzpg32nvnknxkqdkawcm",
    "viewing_key": "zxviews14x52d8y73h84rshcefy32shljk0kk8j4hxk8nvptsk475au4pthtkgl6yhsw7yv6mxv5ld6l3qm7qhsuvwkkg6dr0r2gs3wdvjvjwsmcwm2uft7vvrwl7a28vtv8a6lt8xeptjefdk35umk9jacjep0m3y50n3v6",
    "type": "zaddr",
    "seed": {
      "HDSeed": "b211b2f51295eb7f7f2d2988ebb99c94edd0fb3329bffe2472df12c9422dc1a2",
      "path": "m/32'/133'/0'"
    }
  },
  {
    "num": 0,
    "address": "t1Lb2BUNxaZjs45yPWgrxtzo7ZFXuCCpoHf",
    "private_key": "L4TXJev622KR4h5raEoFQ3iJY7TDXxwZXSGZL6xuVToUqcGffCTs",
    "type": "taddr"
  }
]
$