Vulkan: Automatically generate mipmaps for replaced/scaled textures #13514
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Scaled textures always lack mipmaps (as we only scale the top layer) and replaced textures may lack them.
This generates as many mipmaps as the game had normally specified (later it may be an option to generate more). Mipmaps improve performance and image quality.
This implements it for Vulkan only. OpenGL already has this to some extent.
Also deletes some useless special casing for png loading in Qt builds.