v0.7.3

• Toolchain ECP5:
  • OpenFPGALoader tool added for programing the ECP5 FPGAs (Thanks to Fernando Mosquera (@benitoss))
• New apio package: oss-cad-suite
  • Currently only with the system tools: lsusb, lsftdi, ftdi_eeprom
• Apio system package marked as obsolete (although it can still be installed and used). Use the oss-cad-suite apio package instead
• Refactoring and documentation of the code