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videofilters: Add plugin for pseudo-color effect

Submitted by RaviKiran

Link to original bug (#748994)

Description

Add a new plugin for pseudo-color effect.
http://en.wikipedia.org/wiki/False_color#Pseudocolor

This plugin takes Gray scale image as input and adds color to it based on hue, saturation properties (HSL to RGB). And produces RGB output.

Although videobalance element can adjust hue/saturation of an image, it doesn't add color to a gray scale image.