Allow voting on posts with a 'custom_json' operation
Creating this issue to replace hive 101. Basically I think there is much more value in doing this on the 2nd layer for the following reasons:
- No HF required
- No need to have consensus on a vote that is not supposed to affect the rewards of a comment
- We can easily allow this on old posts/comments (and new ones as well)
- We can make it simpler, with just a +1/-1 to reflect upvotes and downvotes
- It can be easily extended later to support more features
The vote can still be included in the same response field in the API (active_votes) or a new one.