Timeline UI changes

The onion skinning button replaces the old onion skinning area of the timeline, but there's no way right now to change the settings. This will be added in a future commit. More UI changes will soon follow.

Assets/Graphics/Light Themes/Onion_Skinning.png.import

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Assets/Graphics/Light Themes/Onion_Skinning_Hover.png.import

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Assets/Graphics/Light Themes/Timeline/Onion_Skinning_Hover.png.import

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