Develop a version of the rootchain with PoS support #107
Description
Construct a way for multiple validators via the rootchain. If possible to do this through an account model would incredibly useful. Leave the utxo model for regular spends be keep a track of accounts for validators/delegators (only allow withdraws of fees/stake). This would allow for x/stake, x/slashing from sdk to be used on the sidechain. Fee model of the sdk could be leveraged. We could get rid of committed fee as well as the fee utxo.