Image Filtering - Performance Increases

[SonarSonic]

Speed up the image filtering process, at a minimum cache the filtering outcome up until the current filter.

Potential Improvements

• [ ] Multi-threading
• [x] Cache the outcome of the existing filters, so when updating only the new filter must be changed.
• [ ] Use a Direct Buffer for the BufferedImage's / Don't create a new image for every filter (provide a dest)
• [ ] Open GL / Cuda?