A one-shot timer managed by the scene tree, which emits timeout on completion. See also SceneTree.create_timer.
As opposed to Timer, it does not require the instantiation of a node. Commonly used to create a one-shot delay timer as in the following example:
The timer will be dereferenced after its time elapses. To preserve the timer, you can keep a reference to it. See RefCounted.
Emitted when the timer reaches 0.
The time remaining (in seconds).