Refactor code to use calculations at current epoch

[code423n4]

Handle

tensors

Vulnerability details

Impact

Both as a gas optimization and general readability/usability concern: you should make use of the more general functions "atEpoch" to calculate the less general function. For example:

totalSupply() can be rewritten simply as totalSupplyatEpoch( currenctEpoch() ).

If the more general function is already coded, why not use it? It will also save gas.

Proof of Concept

https://github.com/code-423n4/2021-09-bvecvx/blob/1d64bd58c7a4224cc330cef283561e90ae6a3cf5/veCVX/contracts/locker/CvxLocker.sol#L416

Recommended Mitigation Steps

Implement above change.