Modern Creator

Backport to 1.12.2

• New core structure (Main/Objects/Controller/Display/Network/Process/Physics/Sounds).
• Massive sound update: ~580 tracks (acoustic/metal/rock/bass/drum + shower SFX).
• Added/kept blocks: guitar, electric_guitar, bass, piano, drum, refrigerator, sofa, livingtable, louver, lamp_hight, showcase, bathtub, bed, door, curtain, counter, chair, box, shower.
• New decorative bottles (reserve_*): allium, daisy, dandelion, houstonia, orchid, rose, tulip (red/white/orange/pink).
• Added en_us.lang; optimized models/textures for 1.12.2.
• Simplified some sub-variants from 1.20.1 to improve stability/performance.