All code4rena fixes

[0xMaharishi]

Findings & resolution

Code4rena findings, post filter, and ordered by contract name.

Proposed severity ratings are in the second column as per code4rena guidelines.

Note: This PR also contains a number of changes that are not directly related to c4 (e.g. RewardPoolDepositWrapper)

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Contract	Severity	ID	Note/Fix	URL
Aura.sol	1	34	Add protection on updateOperator	code-423n4/2022-05-aura-findings#34
Aura.sol	1	125	Add second variable	code-423n4/2022-05-aura-findings#125
Aura.sol	0	24	Remove libs from aura token	code-423n4/2022-05-aura-findings#24
AuraBalRewardPool.sol	1		Withdraw to treasuryDAO before rewards start. Also mutate AuraLocker. Backup incase bug is found in system, to prevent auraBAL locking
AuraBalRewardPool.sol	0	123	Protections on constructor	code-423n4/2022-05-aura-findings#123
AuraBalRewardPool.sol	0	167	Remove safemath from AuraBalRewardPool	code-423n4/2022-05-aura-findings#167
AuraClaimZap.sol	2	108	Fix as per comment	code-423n4/2022-05-aura-findings#108
AuraLocker.sol	2	261	maxRewardRate	code-423n4/2022-05-aura-findings#261
AuraLocker.sol	2	278	Add blacklisting	code-423n4/2022-05-aura-findings#278
AuraLocker.sol	2	178	max reward tokens on aura locker Add method to “claimExtras” w/ overload	code-423n4/2022-05-aura-findings#178
AuraLocker.sol	1	1	Make queueNewRewards generic and update calls	code-423n4/2022-05-aura-findings#1
AuraLocker.sol	0	28	Remove ABIEncoder	code-423n4/2022-05-aura-findings#28
AuraLocker.sol	0	156	Just change this to amount	code-423n4/2022-05-aura-findings#156
AuraLocker.sol	0	212	Just add	code-423n4/2022-05-aura-findings#212
AuraMerkleDrop.sol	1		Allow withdraw to treasuryDAO within first week before it has started
AuraMerkleDrop.sol	1	316	Subtract pending penalty	code-423n4/2022-05-aura-findings#316
AuraMerkleDrop.sol	0	95	Add check for non zero addr	code-423n4/2022-05-aura-findings#95
AuraMerkleDrop.sol	0	268	move penalty forwarder to constructor	code-423n4/2022-05-aura-findings#268
AuraMinter.sol	0	10	Comment	code-423n4/2022-05-aura-findings#10
AuraVestedEscrow.sol	1	133	Fix as per comment. ALSO check for mismatching array lengths	code-423n4/2022-05-aura-findings#133
AuraVestedEscrow.sol	0	126	Simple check to disallow funding	code-423n4/2022-05-aura-findings#126
BalLiquidityProvider.sol	1	90	Add check	code-423n4/2022-05-aura-findings#90
BalLiquidityProvider.sol	0	285	add ≥	code-423n4/2022-05-aura-findings#285
BaseRewardPool.sol	2	178	max reward tokens on baserewardpool - just add if(max) then do nothing. To avoid bricking, don’t revert. Only called from 2 places: Booster & ExtraRewardsStashV3. StashV3: avoid bricking by limiting manual reward addition. Booster: manual check, will never need more than 10	code-423n4/2022-05-aura-findings#178
BaseRewardPool4626.sol	1	39	SafeMath usage	code-423n4/2022-05-aura-findings#39
Booster.sol	1	243	owner sets vote delegate & feeManager	code-423n4/2022-05-aura-findings#243
ConvexMasterChef.sol	2	313	Add reentrancyguard	code-423n4/2022-05-aura-findings#313
ConvexMasterChef.sol	1	147	remove with update arg, add limit && for add, disable rewardToken or duplicates	code-423n4/2022-05-aura-findings#147
CrvDepositor.sol	2	341	consider disabling minting if cooldown to avoid bpt getting locked	code-423n4/2022-05-aura-findings#341
CrvDepositor.sol	1	343	If the lock is > 1 week old, increase lock time	code-423n4/2022-05-aura-findings#343
CrvDepositorWrapper.sol	2	115	Temporary measure to avoid system freezing is to allow the keeper to set a minOut override	code-423n4/2022-05-aura-findings#115
EstraRewardsDistributor.sol	2	50	Add validation	code-423n4/2022-05-aura-findings#50
ExtraRewardsDistributor.sol	1	240	Whitelisted accs only can add	code-423n4/2022-05-aura-findings#240
ExtraRewardsDistributor.sol	1	180	Whitelisted accs only can add	code-423n4/2022-05-aura-findings#180
ExtraRewardsDistributor.sol	1	5	Simply add > 0. Doesn’t do much tbh but already changing smth else	code-423n4/2022-05-aura-findings#5
ExtraRewardsDistributor.sol	0	230	Make fn private & add reentrancyguard	code-423n4/2022-05-aura-findings#230
Interfaces.sol	0	249	remove abicoderv2	code-423n4/2022-05-aura-findings#249
Many	0	172	compiler and comments	code-423n4/2022-05-aura-findings#172
Many	0	107	mass update and lock compiler v	code-423n4/2022-05-aura-findings#107
PenaltyForwarder.sol	0	49	Mutate ExtraRewardsDistributor	code-423n4/2022-05-aura-findings#49
StashFactoryV2.sol	0	362	add non zero gauge check	code-423n4/2022-05-aura-findings#362