Add webp support for cards images

[add-le]

Add support webp format to the cards images :
Give 25% to 50% smaller image size for same quality as jpg.
Can reduce the cache folder to 25% to 50% its size, for android support can be a good idea.

https://developers.google.com/speed/webp
https://developers.google.com/speed/webp/docs/webp_study

If you find the good settings to convert all superLQ's kevlahnota to webp, without losing much quality, you can achieve near to 30-35% reduce size.

• Need to check if it's work for token and crop images too

Resolves #643

[kevlahnota]

Change title to add webp support for desktop version, mobile version uses libgdx and it doesn't support webp. There's a webp textureloader here: https://github.com/ZumiKua/libgdx-webp-loader
But you need to modify how it load images.

[add-le]

@kevlahnota e37f652 Is it the right way to add the lib loader ? I don't know too much about maven and this gdx system. I don't think I know how it works.

[github-actions]

This PR has not been updated in a while nad has been marked on stale. Stale PRs will be auto closed

[add-le]

Still on it

[github-actions]

This PR has not been updated in a while nad has been marked on stale. Stale PRs will be auto closed

[Hanmac]

@kevlahnota can you conment on this?

[github-actions]

This PR has not been updated in a while nad has been marked on stale. Stale PRs will be auto closed