Version 4.7 - ⚠ PHP 8.1 required - Bugfixes, core upgrade, & album decorations

What's Changed

• Use Enum to enforce stricter types (⚠ php 8.1) by @ildyria in #1618
• Nuke demo generator, does not reflect the latest version. by @ildyria in #1673
• Ensure php version is correct prior migrations by @ildyria in #1671
• Customizable album decorations by @evoludolab in #1631
• More robust fix on HasAdminUser by @ildyria in #1684
• Composer update - php-exif 0.8 + bump to version 4.7 by @ildyria in #1680

Full Changelog: v4.6.5...v4.7.0