Sunhokey X-carriage with x axis endstop

Minor modification of Projectearth7's Sunhokey X carriage (https://www.thingiverse.com/thing:818852) to add the X endstop to the carriage. Also changed the front fan mount. This fan bracket is 6mm wider to better center the cooling ring and it excludes any mount for the side fan (unneeded as mine clips to the head). Fan shroud is ZiegeOne's part (https://www.thingiverse.com/thing:714939)