Upgrade to 0.30 SDK

[jhernandezb]

The upgrade changes are listed below and also fixes #335

Updates to dependencies

• cosmos-sdk=v0.30
• tendermint=v0.29.2
• go-amino=0.14.1
• tendermint/iavl=v0.12.0

Breaking/notable changes in cosmos

• x/state renamed to x/staking see PR
• sdk.CodespaceType is now string (usually the name of the module is used) see PR
• StdSignature no longer serializes AccountNumber and SequenceNumber see PR
• auth.Account: AccountNumber and SequenceNumber are now uint64
• Rename MountStoresIAVL to MountStores see PR
• Minimum fee should be configured in gaid.toml but now they introduced SetMinGasPrices which is not included in v0.30 so left a TODO comment to update in future versions if needed/required see PR
• server.DefaultAppInit is removed see PR
• Tendermint private validator file has changed format and file name but the app will handle this and update the file creating two new files priv_validator_key.json and priv_validator.json.bak both added to gitignore
• CLI got some changes too
• Moniker prop should be configured in config.toml or will panic at runtime since will fail new validations

Action required

Update the genesis file to include the following state in the app_state

  "app_state": {
    "auth": {
      "collected_fees": null,
      "params": {
        "MemoCostPerByte": "3",
        "MaxMemoCharacters": "256",
        "TxSigLimit": "7",
        "SigVerifyCostED25519": "590",
        "SigVerifyCostSecp256k1": "1000"
      }
    },
    "bank": {
      "send_enabled": true
    },
    // "accounts":  [...]
}