Mercury AVX2

- Finally updated it, plz don't hate me I know ya'll been waiting - Builds for ALL DA OSES! - Incorporated some compiler flags from Zen browser, AND, made some commits to Zen as well to add some of Mercury's AVX2 stuff. See > zen-browser/desktop#1216 Thanks to the author for talking to me on Reddit and then accepting my pull request. - Disabled "Normandy", a component that allows Mozilla to alter extension configurations at will remotely. (bleh wtf is that) - Enabled JS_SHELL, for devs looking to use extensions like https://addons.mozilla.org/en-US/firefox/addon/scratchpad/ to get a semblance of that functionality that they removed. - Tabstrip functionality of Firefox View is enabled, without actually enabling firefox view due to it's other bad stuff we don't want (You can still manually enable it in about:config, then re-add it to the tabstrip with the buttons editor). - MacOS builds lack PGO, since I had to cross-compile them. May reduce performance. NOTE: For those looking to build for themselves, cross compiling for MacOS is now broken since Apple complained about Mozilla redistributing the XCode SDK (of course 🙄). The workaround involves a lengthy process to package up the SDK from a Mac, then copy it to your Linux machine. It's outside the scope of these release notes, but I may add instructions to the //docs folder at a later date. UI Update: Next release will have some UI patches from Floorp, a popular Firefox fork. However, remember that Mercury doesn't attempt to heavily modify the UI from upstream Firefox, so don't expect Mercury to end up being a compiler optimized Floorp. I promise there won't be a freakin months long delay in updating. But I also tend to put Thorium and Codium first over my other projects. One man can only do so much, even with as often as I am on the computer doing nerd stuff.