Deprecate the conditional route handlers

[enlight]

• No need to unmarshal every tx multiple times to figure out if it's an EVM tx or not before it hits Call/DeployTxHandler.
• New tx handlers always set TxHandlerResult.Info as soon as they figure out the tx type, legacy handlers didn't do so if the tx failed.
• Cleaned up error handling a bit in the new DeployTxHandler.

Related: https://github.com/loomnetwork/go-loom/pull/478

[enlight]

So after we activate the config, EvmTx is not going to run with loomchain.NoopTxHandler on CheckTx anymore. Need to think about how this would affect receipts and other things.

It won't affect receipts and other things because the new CallTxHandler doesn't actually run any of that code, see https://github.com/loomnetwork/loomchain/pull/1497/files#diff-141a5928106d9d5a533ebaf05559359cR49