Modular Sortition Mechanism

[jaybuidl]

The proposal made by @shotaronowhere is gathering feedback.

I have a proposal for a design choice to increase the modularity and flexibility of Kleros v2. The support of modularity would be compatible with a variety of sortition mechanisms which can be determined by the dispute kits and approved through governance. So sortition trees can be supported, sortition data structures we don't foresee could be supported, and a sortition mechanism i'm calling "sortition mining" would also be supported. I am working on a sample 'sortition mining' contract. Please comment on the proposal when you have time.

@unknownunknown1 is testing the feasibility of making the arbitrator compatible with the proposal here:
master...unknownunknown1:feat/sortition-modularity