Add a callback or a collection of callbacks to a callback list.
Disable a callback list from doing anything more.
Determine if the callbacks list has been disabled.
Remove all of the callbacks from a list.
Call all of the callbacks with the given arguments
Determine if the callbacks have already been called at least once.
Call all callbacks in a list with the given context and arguments.
Determine whether a supplied callback is in a list
Lock a callback list in its current state.
Determine if the callbacks list has been locked.
Remove a callback or a collection of callbacks from a callback list.
once: Ensures the callback list can only be fired once (like a Deferred).
memory: Keeps track of previous values and will call any callback added after the
list has been fired right away with the latest "memorized" values (like a Deferred).
unique: Ensures a callback can only be added once (so there are no duplicates in
stopOnFalse: Interrupts callings when a callback returns false.