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What?
This PR adds contracts for Staking and Reward ERC20 tokens.
Why?
These are required by the Staking Contract (todo) in order to manage liquidity and incentives.
How?
We have made use of the Open Zeppelin Contracts library, and implemented our ERC20's accordingly. The reward and staking tokens have additional functionality as per their anticipated use by the Staking Contract. This is however tentative and subject to change.