* [x] StrategySplitterV2: not cover loss, only check * [x] TetuVaultV2: remove `coverLoss` * [x] TetuVaultV2: remove `insurance`, `initInsurance` * [x] StrategyBaseV2: fix natspecs * [x] StrategyBaseV3: fix natspecs * [x] StrategyBaseV3: fix natspecs * [x] VaultFactory: remove insurance