Delta 3D Printer Heated Glass Bed with levelers

For a Kossel 2020 Delta and other similar Delta 3D printers:
* Adds a glass bed for more convenient printing
* Adds 6 point manual bed leveling.
* Eliminates the need for auto bed leveling inductor which reduces print head weight.
* Allows one-time bed leveling, although minor adjustments can be made even during printing.
* Includes hot end mount without inductor holder and captive hex nuts for easier mounting
* Allows print head calibration without flashing the firmware
* includes carr