WIP: Add methods for configuring record metadata

[shagren]

For PyK4ARecord added new methods which allow to configure mkv metadata: add_tag() and add_attachment()

Now you can create record based on existing record i.e. for filtration and dropping some frames. See test_transfering_calibration()

[shagren]

CC: @lpasselin

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@0940fa8). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #138   +/-   ##
==========================================
  Coverage           ?   81.43%           
==========================================
  Files              ?       12           
  Lines              ?      781           
  Branches           ?        0           
==========================================
  Hits               ?      636           
  Misses             ?      145           
  Partials           ?        0           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0940fa8...7a487b9. Read the comment docs.

[shagren]

Like as not fully ready :(

[lpasselin]

I'll be afk in the woods for the next 2 weeks so will not be able to review.
Feel free to merge when you think it is ready if you don't want to wait for me. You have the maintainer power.