Contract to track baklava Bonuses and Rewards

[timmoreton]

In baklava, we will need to track two sets of values for each participating entity:

• Bonuses, fixed sums that we will convert at some ratio to mainnet Gold but do not factor as a balance on the baklava testnet. Each bonus is a (value, reason).
• Rewards, whose sum R_a for an account a is a multiplier such that a's score in the game is its balance multiplied by 1 + R_a . Each rewards is a (value, reason)

We expect the number of these to be small for each participant.

Make a smart contract that:

• stores bonuses and rewards on a per account basis
• associated view functions
• only owner can append a bonus or reward
• no initial balance needed, and nobody can withdraw balances
• ability to populate initial data from migration to support testnet resets
• script to dump current accounts and balances
• CLI support for functions baklava:bonuses --account x and baklava:rewards --account x