Add a confidence property

[ServerDeveloper9447]

Add the confidence property on determining if the image is nsfw

[d00ML0rDz]

You could probably just do this by totalling up the pornography, hentai and sexy scores and that would give you a decimal of how confident it thinks it's a NSFW image. Or you could do 1 - the neural score.

This is how the isNsfw function works, where if the neutral score is under 0.5, it returns true.

[ServerDeveloper9447]

Maybe, give an option to change the checking score of isNsfw function?