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Implement Lanczos effect using a single pass fragment shader

Arjen Hiemstra requested to merge work/ahiemstra/lanczossinglepass into work/lanczos

This is based on a shader from libRetro that implements Lanczos resampling in a single pass. This removes the need for custom OpenGL code to render things to an FBO, instead relying on purely QML ShaderEffect for the rendering.

Edited by Arjen Hiemstra

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