Marlin 1.1.8 Stable Release for Sunhokey Prusa i3 (configs)

Config update for latest stable Marlin firmware 1.1.8 (March 2018)

1. Get stable Marlin 1.1.8 here:
https://github.com/MarlinFirmware/Marlin/archive/1.1.8.zip
2. Replace configs with downloaded.
3. Flash it!
(tested on MKS Gen 1.2 and 1.4 boards)

For config and flashing details see my first Thing:
https://www.thingiverse.com/thing:1920967

Working features:
- 12v led lighting (second heater pins)
- Manual and mesh bed leveling with save\load options
- EEPROM settings save\load
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