ecppack compress and bit (Closes #94)

Thomas Aldrianrequested to merge
Weissnix4711/spade-swim:ecppack-compress into main

Supersedes !231 (closed)

  • adds --compress option for ecppack, enabled by default if omitted.
    • also enables it explicitly for ecpix5, someone please test
  • enables ecppack bitstream output (default is still svf), for dfu uploads.

Author checklist

  • Added a changelog entry, if relevant
    • You can use ./add_changelog <MR number or a_descriptive_name> to do this
Edited by Thomas Aldrian

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