byuu v4 + higan v110

多機種模擬器 byuu & higan 發布新版，更新如下 :

PC Engine: improved IRQ handling significantly

PC Engine: fixed T-flag instructions, and implemented all addressing modes for it

PC Engine: improved VDP penalty cycle timing

PC Engine: always fire Vblank IRQs every frame, regardless of VDW setting

PC Engine: add support for STreet Fighter II CE's custom mapper

PC Engine: emulated MPR latch used by TMA and TAM instructions

PC Engine: randomize various registers and memory at power-on

PC Engine: do not allow block moves to read from $ff:0800-17ff

PC Engine: always set P.B flag (except when pushing P during BRK)

PC Engine: delay PSG synchronization when not needed (~8% speedup for accuracy profile)

PC Engine: emulate 4-color background and sprite modes

PC Engine: emulate grayscale VCE mode

PC Engine: emulate extra scanline VCE mode

PC Engine: fixed VRAM->VRAM DMA transfers (was transferring one byte less than it should)

PC Engine: improve burst-mode emulation (early VRAM->VRAM termination, etc)

PC Engine: add display timing latching to the performance profile's scanline renderer

PC Engine: many disassembler improvements

PC Engine CD: added skeleton implementation (non-functional)

Mega Drive: fix a crash when loading Sonic & Knuckles or the Game Genie without a daughter cartridge connected

higan: fix System menu option enabling when "Create New System" is selected

icarus: fix typo in save RAM portion of Master System game manifests (was marked as ROM by mistake)

byuu: don't show the program icon briefly when loading a new game

byuu: focus the viewport after loading games

byuu: add trace log path override option

byuu: use save path override for SNES save RAM files as well

https://byuu.org/posts/byuu-v4-and-higan-v110-released