PRICE - image filtering and manipulation Code

filter colr images and filter alpha channel

add stepper and improve controller

do not use intermediate image, also just pad image by keeping the last value

use destination image properties, use unsigned indices, add casts to fix rounding on PPC

mac update for gaussian blur

update parameters on value change

finally implement gaussian function

implement boundaries wrapping and use intermediate image for h result convolution

remove hack

first rough implementation with sawtooth