Allow diff interruption

[ronkorving]

When dealing with logic, the diff of a Tome is not always the only thing happening in a UI. There may be an animation, only after which we want certain changes to be reflected in the UI.

We need a good system that allows these diffs to be applied in bursts, controlled by the party that is applying a diff.

The idea I have right now that seems to be the most flexible is the following:

Server:

t.set('xp', 100);
t.set('xp', 110);
t.set('xp', 120);

Client:

t.xp.on('readable', function (oldValue) {
  t.pauseDiff();
  animateXp(oldValue, this.valueOf(), function () {
    t.resumeDiff();
  });
});