data.Store: updateRecords()

We could add a bulk update method to change multiple fields on multiple records in parallel.

E.g.:

myStore.updateRecords({
    ids: [1, 2, 3],
    endTime: '23:00',
    startTime: '21:00'
});

For non remote stores, this should probably trigger a recordChange event for each affected record.

We can add a new bulk change event as well.

For remote stores, we can create a single ajax request to the BE, containing all changes.

Open for ideas!