RImageManipulator: Manipulate and apply effects on images

This class can be used to manipulate and apply effects on graphical images.

It can load images in the GIF, JPEG and PNG formats, and apply several types of effects.

Currently it supports the effects: resize, rotate, apply filters like colorize, blur, negate, emboss, contrast, interlace, crop, draw text, fog, sepia.

It can also apply multiple effects in a single combo operation.

The resulting image is saved to a file.