Reduce SX Issuance from Bet Mining to 10,000 SX/day

This proposal is to reduce the maximum new SX Bet Mining rewards from 150,000 SX per week to 70,000 SX now that taker fees have been lowered by 50% from 4.00% to 2.00%.

This proposal is pretty straight forward - we are lowering taker fees by 50% so it makes sense to lower bet mining rewards by roughly 50% as well. Reducing to an even 10,000 SX per day is easy to understand and will pave the way for potentially automating bet mining payments to be made daily.

This reduces the number of SX tokens being issued each year through bet mining by 53% from 7,800,000 to 3,640,000 SX per year, improving SX tokenomics and making SX even more scarce.

See discord for discussion