1.66.12 - Linux, Windows, & MacOS

• Updated npm packages
• Restored Windows 7/8/8.1 support
• Should also work on Ubuntu 16.04/18.04 & Debian 8/9
• Should fix issues installing some extensions/packages
• Added initial MacOS x64 support
• Updated tabs package, and "Close All Tabs" in the File menu now comes before "Quit" or "Exit" (which makes more sense)
• Enabled dark mode so that menubars are dark on all platforms.
• More SIMD optimizations
• Added SSE4.1 builds for people with CPUs that lack AVX
• Re-organized scripts
• Fixed branding on setting descriptions