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Changelog

• UI: implement LCD1x shader (thanks @DestinyXZ9)
• ARM: implement multiplication carry algorithm (thanks @zaydlang, @calc84maniac)
• ARM: fix LDM^ bus conflict logic breaks in user mode
• ARM: fix out-of-bounds accesses when switching in or out of an invalid CPU mode
• ARM: optimize GPR and SPSR reads
• ARM: optimize LSL, LSR, ASR and ROR arithmetic
• DMA: allow CPU internal ticks during CPU<->DMA transition cycles
• PPU: correctly reset OBJ mosaic Y counter (thanks @j-mattsson)