feat: make Token pausable #712

Job	Run time
Get Echidna test names	4s
Slither	3m 18s
Check storage layout (contracts/legacy/ReserveSpenderMultiSig.sol:ReserveSpenderMultiSig)	2m 4s
Lint & Test	5m 53s
Check storage layout (contracts/legacy/StableToken.sol:StableToken)	2m 4s
Check storage layout (contracts/legacy/Exchange.sol:Exchange)	2m 4s
Check storage layout (contracts/legacy/GrandaMento.sol:GrandaMento)	2m 4s
Check storage layout (contracts/swap/Broker.sol:Broker)	2m 7s
Check storage layout (contracts/swap/BiPoolManager.sol:BiPoolManager)	2m 5s
Check storage layout (contracts/swap/Reserve.sol:Reserve)	2m 3s
Check storage layout (contracts/oracles/BreakerBox.sol:BreakerBox)	2m 4s
Check storage layout (contracts/oracles/SortedOracles.sol:SortedOracles)	2m 5s
Check storage layout (contracts/tokens/StableTokenV2.sol:StableTokenV2)	2m 5s
Run echidna tests (EchidnaFixidityLib)	1m 23s
Run echidna tests (EchidnaStableToken)	1m 38s
	33m 1s

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