Following community propoposal, to increase DROPIUM length and charity fee

Summary To increase standard DROPIUM parameters to 90 days and 50%-60% charity fee; according to the community proposal https://forum.opium.network/t/proposal-eth-opium-liquidity-mining-charity-fee-should-be-60-over-90-days-period/116

Rationale To increase rewards for long term holders on expense and make DROPIUM more efficient.

TODO Deploy standard DROPIUM with [90day+50% fee] parameters, assume those parameters unless there is a specific case.

Executors Opium Team