2.0.0: XP 12, PHP 7.4+

• Dropped support for PHP 7.0 - 7.3 - @thekid
• Dropped support for XP <= 9, see xp-framework/rfc#341 - @thekid
• Made compatible with XP 12, Compiler version 9.0.0 - @thekid
• Added PHP 8.4 to the test matrix - @thekid