Resize: Resize and place watermarks on images

This class can be used to generate resized images.

It takes a given image and creates a copy with a new given size. The class can keep proportions of the original image upon setting a given width or height.

The class can also place a watermark image in one of the resized image corners or in the center.

The final image may also be rotated by a given angle. The background color of the image regions that may become empty is configurable.

The comments in the code are in Portuguese.