Marlin 2.1.x For Anycubic i3 Mega

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I've had an Anycubic i3 Mega for several years now and I've made several upgrades to it, including swapping out the stepper motor drivers for TMC2208's and flashing the Marlin 2.0 firmware put together by [Dave Ramiro](https://github.com/davidramiro/Marlin-Ai3M), but after compiling a new version of Marlin for my Newereal Printer (Successfully I might add!), I decided to upgrade my Anycubic to the most recent version of Marlin. Marlin 2.1.1 for the Anycubic i3 Mega can be found here: [https://github.com/modern-hobbyist/Marlin-2.1.1-Anycubic-i3-Mega](https://github.com/modern-hobbyist/Marlin-2.1.1-Anycubic-i3-Mega) This build is based off the [Marlin bugfix-2.1.x branch](https://github.com/MarlinFirmware/Marlin), and as such, is still beta firmware and should be used with caution. Please use this firmware at your own risk! Currently, I haven't created any releases on GitHub, but instructions for building this firmware are in the README of the repo. I would recommend building it yourself anyways to gain experience, but you'll need to configure it your your printer either way. If you have stock stepper drivers still installed on your printer, then you'll want to make sure the following line is COMMENTED OUT in the Configuration.h file in the Marlin directory before building it, like this. `//#define I3MEGA_HAS_TMC2208` However, if you're like me and you swapped out the A4988 drivers for TMC2208 drivers, then you'll want to leave that line in the code: `#define I3MEGA_HAS_TMC2208` The last real configuration option you'll have is whether or not to enable BLTouch in the firmware. This line is actually right above the TMC2208 line, but I personally have it commented it out: `#define I3MEGA_HAS_BLTOUCH` If you comment this out, like me, it will enable mesh bed leveling which interestingly enough is the main reason I wanted to upgrade my firmware. Feel free create issues or pull requrests on the GitHub repo if you have any bug fixes or updates you'd like included in the firmware, though I can't promise I'll be that attentive to the firmware.