Add Azteeg X3 Pro as motherboard 68
Add digipot i2c control for MCP4451
Allow M907 to set i2c digipot currents in amps
Fix Makefile to allow Azteeg motherboards
Fix Makefile to allow Wire libraries only
Add beeper pin for Azteeg X3 Pro
Added pins for Azteeg X3 Pro under motherboard 68
Default is to not define digipot_i2c
fix typo
Merge pull request #748 from wolfmanjm/add/azteegx3pro

Add/azteegx3pro