Mirror

Brings the 26.1 build up to parity with 0.1.2 for 26.2:

• Hall of mirrors: recursion depth is now configurable up to 8 bounces (was 2), so two facing mirrors show reflections receding into the distance.
• Distant mirrors no longer flicker when a near mirror spends the frame budget on deep recursion.
• Wider settings ranges: up to 16 mirrors on screen, 128 render passes per frame, 64 chunks of reflection distance.
• The mirror now appears in the Functional Blocks creative tab.
• The mirror has a solid oak back panel instead of a see-through frame when viewed from behind.
• Reflections are now hidden behind the item in your hand instead of drawing over it.
• Mirrors seen inside another mirror's reflection keep their frame.
• Reflections reset cleanly when switching worlds or dimensions.