Copy all MMU*.hex firmware files

[3d-gussner]

Description

Copies all MMU*.hex files in CMAKE

Behaviour/ Breaking changes

Easy way update of MMU firmware files to MK404 by uploading new MMU hex to folder

Have you tested the changes?

Yes I tested it and it copies the Newest version.

Possible improvement would be to also rename the newest to be used MMU firmware to a known filename being automatically used when compiling the MK404.
With parameter -F it is always possible to select a different MMU firmware file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (faf2283) 90.77% compared to head (22fec02) 90.77%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #372   +/-   ##
=======================================
  Coverage   90.77%   90.77%           
=======================================
  Files         153      153           
  Lines        7851     7851           
=======================================
  Hits         7127     7127           
  Misses        724      724           

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