* move multipliers to their own file
* add multipliers per denom to MsgClaimHardReward
* claim with multipliers per denom for hard claims
* remove unused error
* add multipliers per denom to params
connect to to hard claiming
* temporary fix migration
* update usdx claiming for new multiplier params
* claim with multipliers per denom for delegator
* claim with multipliers per denom for swap rewards
* tidy up multiplier name validation
* rename new multipliers field in params
* remove old multpliers from params
* clear up various TODOs
* add tags to new structs
* remove dead code