* Use cosmossdk.io/errors for deprecated error methods
* Update error registration with cosmossdk.io/errors
* Use cosmossdk.io/math for deprecated sdk.Int alias
* Fix modified proto file
* Update sdk.Int usage in swap hooks
* Update e2e test deprecated method usage
* use kavamint in incentive to calculate staking apy
* use kavamint minting: rewards_earn_staking_integration_test
* update incentive tests to mint only with kavamint
* remove x/mint from incentive tests
* remove x/mint from kava app
* fix minting in x/auction tests
* replace simapp fund calls with test helper
* remove mint state from genesis.json
* add deposits to genesis state
* import/export genesis with deposits
* add helper keeper method + update tests
* invariants + tests
* register invariants on module
* fix genesis test invariant init
* clean up invariants test
* remove comment from test file
* fix invariants test
* run 'make proto-all'
