[BUGFIX] Exchange flag icons from SVG to PNG

All flag icons are exchanged to PNG to reduce file size and
fix viewport rendering problem in IE11.

Moved following flag icons from IconRegistry to registerFlags

* flag-an
* flag-cs
* flag-qc

Removed icon 'flag-fam', this was the famfamfam flag and has no use

Remove US states flags

Releases: master, 8.7
Resolves: #76291
Change-Id: I3d45b76901c2584680c8fcaa49aa0fed308405fc
Reviewed-on: https://review.typo3.org/53011


Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Jo Hasenau <info@cybercraft.de>
Tested-by: Jo Hasenau <info@cybercraft.de>
Reviewed-by: Jasmina Ließmann <code@frauliessmann.de>
Tested-by: Jasmina Ließmann <code@frauliessmann.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>