Venus Calculation Improvement + Dynamic Buffer Unit

[Havoc19]

1. Now while repaying and withdarawl, we can add bufferUnit

There are 2 buffer units - flashloan - so take extra flashloan to repay the debt collateralAmount - to pull a little more collateral amount to repay the flashloan

2. Improvement in withdrawTransactions function in venusAssetHandler - added swapCount to keep track of swapData

[langnavina97]

collateralAmount - to pull a little more collateral amount to repay the flashloan ==> is this when we repay directly with vault tokens?

[Havoc19]

collateralAmount - to pull a little more collateral amount to repay the flashloan ==> is this when we repay directly with vault tokens?

Yes

[aj07]

This looks good.. we can merge