addon 2.x [tl] Image Optimizer for XF 2.x 2.1.6

Notable changes:

• Fixed stats not updated.

Notable changes:

• Added new tools to test with optimize image options. You can see it at: ACP -> Tools -> [tl] Image Optimizer: Test images
• Added new option: Only optimize images which its has size at least X kilobytes (KB)
• Support optimize image in fly; optimize as soon as user upload images.
• Improvement processing images.