resources: Remove derivative images
This commit adds `ImageUtil::bufferedImageFromImage`, `ImageUtil::alphaOffset`, `ImageUtil::grayscaleImage`, and `ImageUtil::flipImage` functions and applies them to client and plugin code to remove unneeded derivative images from the resources directory.
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Before Width: | Height: | Size: 16 KiB |
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Before Width: | Height: | Size: 16 KiB |
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Before Width: | Height: | Size: 16 KiB |
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Before Width: | Height: | Size: 16 KiB |
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Before Width: | Height: | Size: 16 KiB |
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Before Width: | Height: | Size: 242 B |
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Before Width: | Height: | Size: 16 KiB |
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Before Width: | Height: | Size: 122 B After Width: | Height: | Size: 122 B |