neorv32-de0n-xboot

Removed unused files

Corrected readme.md

Updated NEORV32 to v1.12.3.3 and used Quartus Prime Lite v20.1.1

HW breakpoints was disabled by setting CPU_EXTENSION_RISCV_Sdtrig to false. This was needed because debugging does not worked correct.

Corrected memory map typo