Builds FFmpeg on Linux (not included).
Adds the NONE image format (not an image).
Adds the default preview format and height in the configuration.
Adds fileTypeFromString and getImageFormat.
Calls IPreview only for the files types the extensions can handle.
Generates the preview of the files just after their identification.
Allows LightBird::saveImage to also resize the image.
Makes TagLib resize the preview with Qt.