Optimize Image and Add to Additional Location (Ref: #596)

[Zallb]

This pull request optimizes the image initially included in PR #596 with Zopflipng. Additionally, replacing the old image that was previously missed in the ip2c.

Please review the changes and inform me of any other locations where the old flag might still be in use.

[Fernando-A-Rocha]

This is not your fault, but ideally we shouldn't have duplicated flag images in the official resources. If we're keeping them, they should be centralized in 1 res.

[AlexTMjugador]

This PR is nice, although I wonder why you specifically chose Zopflipng for the optimization, because as far as I am aware it's a mostly unchanging piece of software that isn't getting improvements these days.

Did you try out other optimizers, like Oxipng? (Disclaimer: I'm a Oxipng contributor.)

[Zallb]

This PR is nice, although I wonder why you specifically chose Zopflipng for the optimization, because as far as I am aware it's a mostly unchanging piece of software that isn't getting improvements these days.

Did you try out other optimizers, like Oxipng? (Disclaimer: I'm a Oxipng contributor.)

Because most MTA assets (this repo included) use the same tool to optimize images (https://forum.multitheftauto.com/topic/119032-tool-png-optimizer)

Maybe if Oxipng well outperforms this tool, it might be worth to have everything re-optimized.. Last time I downloaded the installer I was shocked by the 100+ MB size

[AlexTMjugador]

I see, I was not aware of that forum post. It's fair enough to try to keep things simple by standardizing on a single PNG optimizer.

On the topic of Oxipng's install size, it'd be interesting to note where you're getting it from, because the upstream CLI binaries for the v9.1.3 release are only around ~600 KiB big. So any significant size difference ought to be caused due to additional features or bundled software.