| Add AlphaFilter, deprecate VoidFilter (#4349) * Add AlphaFilter, deprecate VoidFilter * better docs * shorter initialization | 
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| src/deprecation.js | 
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| src/filters/alpha/AlphaFilter.js 0 → 100644 | 
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| src/filters/alpha/alpha.frag 0 → 100644 | 
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| src/filters/index.js | 
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| src/filters/void/VoidFilter.js 100644 → 0 | 
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| src/filters/void/void.frag 100644 → 0 | 
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