µCNC v1.5.5

Version 1.5.5 fixes an issue with probing both on core files and STM32F chips.
This also introduces 2 new configuration override files that can be used with the new µCNC configuration builder tool µCNC configuration builder tool. Note that not all configurations are available in the tool and are some features are still being developed.

Added

• added dummy configuration override files to support µCNC config builder web tool (#325)

Fixed

• fixed PROBE ISR issues on STM32 (#322)
• removed deprecated config that prevented probe from working correctly if PROBE_ISR was not configured (#322)