* add test for validate multi reward periods
* tidy up: combine files
* don't accumulate global indexes containing zeros
Previously if the time since last block was 0,
indexes were added containing 0s.
Now leave them out. Missing is assumed to be 0.
* move state independent test to types folder
* clarify reward source concept to "source shares"
- rename variables and update doc comments
- extract method from swap accumulation
* tidy up and expand swap accumulation unit tests
* rename swap test file to match others
* update swap pool id format in tests
* refactor borrow accumulation, use new accumulator
* refactor supply accumulation, use new accumulator
* refactor delegator accumulation, use accumulator
* refactor usdx accumulation, use new accumulator
* fix types const
* remove unsed methods
* more usdx minting param validation.
Protect against the rewards per second denom changing.
It should always be "ukava".
* add safety check in InitGenesis
It prevents huge accumulations on the first block by limiting all
previous accumulation times to be within one year of genesis
* add todo for adding swp token distirbution info
* organise testing committee gen state
* remove repeated test app initialization
* minor fixes from linter in tests
* move more setup to SetupApp
* split up KeeperTestSuite for each reward type
* simplify KeeperTestSuite
* simplify PayoutKeeperSuite
* simplify DelegatorRewardSuite
* simplify SupplyRewardsSuite
* simplify BorrowRewardsSuite
* simplify USDXRewardsSuite
* add auth genesis builder for easier test setup
* migrate all incentive tests to auth builder
* add incentive genesis builder for easier setup
migrate hard incentive tests
* migrate all tests to incentive builder
* add hard genesis builder
* small tidy ups
* deduplicate initialTime from borrow tests
* deduplicate initialtTime from supply tests
* deduplicate initialTime from usdx and keeper tests
* deduplicate initialTime in delgator tests
* deduplicate genesis time in payout test
* deduplicate test app initialization
* make authGenesisBuilder available for all modules
* remove unused pricefeed setup
* export incentive genesis builder
* remove commented out test cases
* migrate cdp test to new test state builders
* migrate vv payout tests to use new builders
* group reward code by type
* split out usdx reward tests into own file
* split out delegator reward tests into own file
* split supply borrow reward tests into own files
* sync order of test functions in files
