Made a number of fixes to support old FRB projects (pre GLUX version 8). · vchelaru/FlatRedBall@b9b77b9

The following actions uses node12 which is deprecated and will be forced to run on node16: microsoft/setup-msbuild@v1.0.2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Build: Engines/FlatRedBallXNA/FlatRedBall/TimeManager.cs#L676

Unreachable code detected

Build: Engines/FlatRedBallXNA/FlatRedBall/SpriteManager.cs#L1398

'StaticMethodInstruction' is obsolete: 'Use DelegateInstruction or Call on IInstructibles'

Build: Engines/FlatRedBallXNA/FlatRedBall/SpriteManager.cs#L1399

'StaticMethodInstruction' is obsolete: 'Use DelegateInstruction or Call on IInstructibles'

Build: Engines/FlatRedBallXNA/FlatRedBall/Graphics/Particle/Emitter.cs#L504

'Sprite.CustomBehavior' is obsolete: 'Do not use this! This will go away. Use the Entity pattern instead'

Build: Engines/FlatRedBallXNA/FlatRedBall/Graphics/Particle/Emitter.cs#L659

'Sprite.PixelSize' is obsolete: 'Use TextureScale'

Build: Engines/FlatRedBallXNA/FlatRedBall/Graphics/Particle/Emitter.cs#L659

'EmissionSettings.PixelSize' is obsolete: 'Use TextureScale instead. TextureScale = PixelSize * 2'

Build: Engines/FlatRedBallXNA/FlatRedBall/Graphics/Animation/AnimationLayer.cs#L122

The variable 'indexToShow' is assigned but its value is never used

Build: Engines/FlatRedBallXNA/FlatRedBall/SpriteManager.cs#L2279

'Scene.SpriteGrids' is obsolete

Build: Engines/FlatRedBallXNA/FlatRedBall/SpriteManager.cs#L2281

'Scene.SpriteGrids' is obsolete

Build: Engines/FlatRedBallXNA/FlatRedBall/SpriteManager.cs#L2290

'Scene.SpriteGrids' is obsolete

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