Make SplitAndDelay a singleton

[APRashedAhmed]

Expected Behavior

Calling the constructor class SplitAndDelay should just return the same instance every time after the first call.

Current Behavior

A new instance will be created from the ground up every time.

Possible Solution

Implement the singleton pattern for the SplitAndDelay class

Context

Since there is only one hard x-ray split and delay there will never need to be a reason to have multiple instances of the object. This would formalize this in the code.