v1.4.0

Threads now support adding multiple events to actions on both the parent and child threads. This can be done naturally by adding new events to the same ID. Threads.addAction and Thread.add will return the ID of the current event to make it easy to remove that event when needed. Use the new function Threads.removeActionAt(id, index) and Thread.removeAt(id, index) to remove the event listener by its index.