FCEUX full changelog

The 2.6.6 release is mainly a maintenance update for the mappers and emulation core with a few new features added in.
Some of these new features apply only to the Qt/SDL version of the GUI.

Qt/SDL Build Improvements:
Added Windows to supported operating systems.
Now buildable against both Qt5 and Qt6.
Unix OS build fixes.
Qt/SDL New Tools:
Added a pattern table tile editor to the PPU viewer.
Added a sprite table viewer window.
Added an NES palette color editor tool. Can now edit palette RGB values in realtime.
Qt/SDL Nametable Viewer:
Added tile and attribute gridlines visibility feature.
Rearranged window layout.
Viewport now has zoom levels.
Viewport now has context menu functionality.
Qt/SDL PPU Viewer:
Added tile gridlines visibility feature
Improved active palette display.
Added pattern table tile viewer context menu options.
Added a click or hover focus policy option to select tile via mouse.
Qt/SDL Movies:
Added AVI and WAV recording capability.
Qt/SDL Trace Logger:
Fixed buffer overrun issue.
Improved disk write performance.
Qt/SDL Hex Editor:
Improved editor responsiveness.
Added a font selection option for text customization.
Added row / column coloring options.

Common:
•64 bit build support
Emulation:
Added Mapper 111 cheapocabra
Added Mapper 190
Added RAM Init Options: default (00 00 00 00 FF FF FF FF as always), all FF, all 00, random
New UNIF mappers
Mapper 30 4-screen support
Mapper 5 MMC5 large WRAM support
VRC7 patch set finalized with correct values dumped by Nuke.YKT
Fixed rendering and debugging of mirrored palette entries
Lua:
Various improvements and bug fixes to pre-existing functions
Fix parsing of lua colors over 0x80000000 on 32bits systems
Extra colors available to lua overlays
Lua write callbacks: adding optional third parameter to retrieve the value written
Added Sprites.lua script to visualize sprites
Zapper control
New Lua functions:
Emu.exit()
Rom.getfilename()
Zapper.set(table input)
Win32:
Various GUI improvements and bug fixes
Fixed font rescaling issue
Relative position mouse support for better fullscreen mouse capture
Left and right mouse buttons no longer conflict with each other
Virtual boy controller