Return the balances across all whitelisted assets of the wallet

URL: ```http:://127.0.0.1:11211/json_rpc```
### Request: 
```json
{
  "id": 0,
  "jsonrpc": "2.0",
  "method": "getbalance",
  "params": {
  }
}
```
### Request description: 
```

```
### Response: 
```json
{
  "id": 0,
  "jsonrpc": "2.0",
  "result": {
    "balance": 10000000000,
    "balances": [{
      "asset_info": {
        "asset_id": "f74bb56a5b4fa562e679ccaadd697463498a66de4f1760b2cd40f11c3a00a7a8",
        "current_supply": 500000000000000000,
        "decimal_point": 12,
        "full_name": "Zano wrapped USD",
        "hidden_supply": false,
        "meta_info": "Stable and private",
        "owner": "f74bb56a5b4fa562e679ccaadd697463498a66de4f1760b2cd40f11c3a00a7a8",
        "ticker": "ZUSD",
        "total_max_supply": 1000000000000000000
      },
      "awaiting_in": 1000000000000,
      "awaiting_out": 2000000000000,
      "total": 100000000000000,
      "unlocked": 50000000000000
    }],
    "unlocked_balance": 11000000000
  }
}
```
### Response description: 
```
    "balance": Native coins total amount
    "balances": Balances groupped by it's asset_id
      "asset_info": Asset info details
        "asset_id": Asset ID
        "current_supply": Currently emitted supply for given asset (ignored for REGISTER operation)
        "decimal_point": Decimal point
        "full_name": Full name of the asset
        "hidden_supply": This one reserved for future use, will be documented later
        "meta_info": Any other information assetiaded with asset in a free form
        "owner": Owner's key, used only for EMIT and UPDATE validation, could be changed by transferring asset ownership
        "ticker": Ticker associated with asset
        "total_max_supply": Maximum possible supply for given asset, can't be changed after deployment
      "awaiting_in": Unconfirmed amount for receive
      "awaiting_out": Unconfirmed amount for send
      "total": Total coins available(including locked)
      "unlocked": Unlocked coins available(the ones that could be used right now)
    "unlocked_balance": Native coins total unlocked amount

```
