Implement batched messages for Digiline Chests

[andriyndev]

This patch implements wrapping signals, which were send in a very short interval (<= 0.1 seconds), into batches. This is needed to prevent Lua Controller from burning when using batch move (performed by selecting an item, and clicking on an item of the same type with Shift pressed). This causes the chest to send Digiline signals for each added stack within milliseconds that will cause the connected Lua controller to burn, and since Digiline chests can be accessed by any player, this gives any player possibility to burn any Lua controller connected to a Digiline chest. This patch implements sending several Digiline chest events in a single Digiline signal if the previous Digiline signal was sent or included into the pending batch less than 0.1 seconds ago. Thus, in case of using batch move, the first chest event is sent as a separate Digiline signal (since we cannot know in advance about the upcoming events), and the next events are included into a batch.