[Feature Request] Filters for images

[TheDoom95]

This option is not necessary for telephones, since controlling the brightness, contrast, etc. is not necessary.

It is so hard to read at night, my eyesight is tired, and the white light bothers me. I tried using a css filter in the browser to lower the brightness and it worked.

In this image, using filter: brightness, gives me the result so we could have the view more relaxed and without forcing it.

An option in the tachiyomi reader would be ideal.

Before

After

[schroda]

done with #807