M200 implementation
Fixed math

This is why I wanted to sleep on the code I wrote while falling asleep
rather than immediately submitting a pull request.
Merge pull request #737 from whosawhatsis/M200

M200 implementation
Group hardware files for Arduino 1.x.x into hardware folder
Merge pull request #738 from whosawhatsis/Marlin_v1

Group hardware files for Arduino 1.x.x into hardware folder
Merge branch 'Marlin_v1' of https://github.com/ErikZalm/Marlin into Marlin_v1