Device tree plugin fixes

[jstucke]

device tree plugin fixes:

• fix for the plugin generating summary entries for files where no device tree was found
• remove binary data from the device tree during analysis (so that large chunks of binary data do not cram the database)
• fix dts highlighting link

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.44%. Comparing base (0c8e723) to head (feaf83b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1453      +/-   ##
==========================================
+ Coverage   92.43%   92.44%   +0.01%     
==========================================
  Files         370      370              
  Lines       20833    20822      -11     
==========================================
- Hits        19256    19248       -8     
+ Misses       1577     1574       -3     

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