1.54

• Changed the S-SMP core module to one written by byuu. (byuu, BearOso)
  This has the effect of increased accuracy, fewer
  speed hacks, but also regresses a few speed-hack games.
• Improved IRQ emulation in several cases. (OV2)
• Added rewind support. (Themaister, OV2)
• Included libretro port. (OV2, libretro team)
• Added bps soft-patching support (OV2)
• Fixed MMC bank register bit 7, restored 64mbit ExLoRom
  map (FuSoYa)
• GTK+, Windows: Added xBRZ filter (Zenju, OV2, nmagre)
• GTK+: Fixed several issues with GTK+3. (BearOso)
• GTK+: Added extra aspect ratio options. (BearOso)
• GTK+: Added option to mute sound when using turbo mode. (BearOso)
• GTK+: Fixed expose handling to reduce overdraw and (BearOso)
  improve performance.
• GTK+: Updated and universalized Spanish translation. (jristz)
• Unix: Added Xv support and fixed several bugs. (greg-kennedy)
• Win32: Added CG meta shader support (OV2, Themaister)
• Win32: Added support to detect joypad changes (OV2)
• Win32: Fixed unicode command line parameters,
  Fixed controller command line parameters (OV2)
• Win32: Added quit hotkey (OV2)
• Win32: Fixed custom rom dialog (OV2)
• Win32: Fixed various cheat dialog issues (gocha, OV2)
• Win32: Added hotkey for fast forward toggling (gocha)
• Win32: Added drag and drop support for movies (gocha)
• Win32: Fixed blargg filter for regular width hires (OV2)
• Win32: Fixed snapshot loading from unicode paths (OV2)
• Win32: Changed open-with file-association method, should
  no longer change explorer icons for otherwise
  unassociated extensions; removed legacy extensions (OV2)