Implement a double reward locking mechanism

As observed on the Maiar Dex - they have the system where double rewards can be issued, but the reward tokens are locked. These can be reinvested, but not swapped.

This should allow a much better APR for long term holders, but shorter term holders can optionally still have the flexibility, but at a lower rate. Also means that it would discourage large dumps.

I think its only feasible to apply this to kogecoin, unless anyone wants to partner and have the same mechanic applied.