Pretty-print: print token's symbol after the amount

[tjanez]

Additionally, change transaction's pretty-printer to transaction's method name and body before the rest.

Example output before this change for oasis-node consensus show_tx CLI command:

Hash: 36c5da997aed1065acd726a9358578ad94588efee9b60585cd1dcb0130894d19
Signer: 8E6DSXn0elXyIF9pYfoSg6+/LK9HeNONJia2rdD3Ozg=
        (signature: cdqMW6aYDUJcYwxcKuC7eY6ycaYGxNQ4jxMdw9U9yxIgPTrkEGlzIQn7RdmaGbyyXc5S5/N1pKWEQsQbli7sBw==)
Content:
  Nonce:  0
  Fee:
    Amount: ROSE 0.0
    Gas limit: 2000
    (gas price: ROSE 0.0 per gas unit)
  Method: staking.Withdraw
  Body:
    From:   oasis1qzn7ztfjlc962yy5yz50zt6tedl60p0aw5n98s0k
    Amount: ROSE 300.0
Other info:
  Genesis document's hash: e2a76b23e48639d7e08c961af77aaf55498c90fd01b70ec996d8f1906869b0d1

Example output after this change for oasis-node consensus show_tx CLI command:

Hash: 36c5da997aed1065acd726a9358578ad94588efee9b60585cd1dcb0130894d19
Signer: 8E6DSXn0elXyIF9pYfoSg6+/LK9HeNONJia2rdD3Ozg=
        (signature: cdqMW6aYDUJcYwxcKuC7eY6ycaYGxNQ4jxMdw9U9yxIgPTrkEGlzIQn7RdmaGbyyXc5S5/N1pKWEQsQbli7sBw==)
Content:
  Method: staking.Withdraw
  Body:
    From:   oasis1qzn7ztfjlc962yy5yz50zt6tedl60p0aw5n98s0k
    Amount: 300.0 ROSE
  Nonce:  0
  Fee:
    Amount: 0.0 ROSE
    Gas limit: 2000
    (gas price: 0.0 ROSE per gas unit)
Other info:
  Genesis document's hash: e2a76b23e48639d7e08c961af77aaf55498c90fd01b70ec996d8f1906869b0d1