Separate Scene Delegate in Separate Class to Avoid Double Initialization

[PSchmiedmayer]

Separate Scene Delegate in Separate Class to Avoid Double Initialization

:recycle: Current situation & Problem

• Adding a scene delegate in #67 introduced a bug where the app delegate was instantiated twice.

:bulb: Proposed solution

• Separates out the functionality of handling the scene delegate in a separate class, avoiding double initializations

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