Sébastien Saint-Sevin

I've added a simple function to detect the browser scrollbar width and adapt the style offset to this exact value.

## Description ## Motivation and Context ## Types of changes - [x] Bug fix (a non-breaking change which fixes an issue) - [ ] New feature (a non-breaking change which...

clean centroid & default_pin code

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- [X] Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

Add alpha channel to sprites

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## Description This PR adds an optional alpha channel to sprite commands. There is a corresponding PR in scenic_driver_local to handle that change. ## Motivation and Context This is very...