A fixed set of reactions (+1 -1 laugh hooray confused heart rocket eyes): issue react / mr react [--comment <id>] <reaction> [--remove], idempotent, with the permission comment has. show JSON carries counts and me per item and comment ids; the web shows a button per reaction to signed-in readers and counts to everyone. No notification, feed row or webhook. Migration 0069. Parity/Users/CHANGELOG.
Closes #291