Improve the cli state call command

[wadealexc]

./lotus state call is currently unusable for most actor methods, as parameter parsing does not support many types.

This PR changes the call command to accept parameters as base64 or hex strings, as these formats are used extensively in other CLI commands.

Additionally, call has been changed to support multiple formats for message return:

• decoded (default): Returns JSON based on the return type of the method called
• raw: Returns the raw []byte found in the receipt
• hex: Converts the returned data to hex
• base64 Converts the returned data to base64

Here's an example:

alex-pc$ lotus state call --from f0127573 f0127595 23 RACipzE=
Call receipt:
Exit code: 0
Gas Used: 0
Return:
{}
alex-pc$ lotus state call f04 9
Call receipt:
Exit code: 0
Gas Used: 0
Return:
{
  "RawBytePower": "5903779890947162112",
  "QualityAdjPower": "5905615863821533184",
  "PledgeCollateral": "71023842284078169744154578",
  "QualityAdjPowerSmoothed": {
    "PositionEstimate": "2009447455836142781845833807839954701917245286790497884694",
    "VelocityEstimate": "5306208777810336014187026111611315363244696189173411"
  }
}

[magik6k]

This is much better, thanks!