Flags update

[Rushaway]

Description

Make brand new flags (250+ the zz for unknow)
Also deleted useless image: (not following iso 3166 code format)

• england.jpg
• europeanunion.jpg
• fam.jpg

Motivation and Context

Making look more modern, using transparency

How Has This Been Tested?

See on the default theme the render is way better than original flags..

Screenshots (if appropriate):

Before (jpg):

With this PR: (png)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.

[Hackmastr]

This is great, thanks!