Implement Debug for all types that work with QDebug

[jnbooth]

This PR adds Debug implementations to all types that a QDebug data stream accepts.

Note: Some types incorrectly used QDebug output to implement Display instead of Debug. This PR does not remove those implementations because that would be a breaking change, but they probably should be removed for the next major release.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (953bce3) to head (a28c1c7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1162   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           73        73           
  Lines        12446     12446           
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  Hits         12446     12446           

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[LeonMatthesKDAB]

Hi @jnbooth, thank you for this contribution!
It's great to see you're using CXX-Qt actively and I'm very happy to see the improvements that come out of it 😃

This PR mostly looks good. I believe it can be simplified a little bit more, as the toQString function should actually not be necessary anymore, and there are a few nitpicks to take care of.

Then we should be able to merge this 🥳

[LeonMatthesKDAB]

Hi @jnbooth sorry for the late reply.

I'm still in favor of accessing the toString function directly.
They're part of Qts public API so adding them in -lib by directly wrapping them is fine.
We can always add From/Into implementations in addition.
Once that is changed and rebased I can approve the PR :)

[jnbooth]

@LeonMatthesKDAB I've done that and merged in the latest changes, but now the tests seem to be broken and I don't know why...

[ahayzen-kdab]

Appears CI is still failing due to a clippy warning

error: function `qfont_to_debug_qstring` is never used
   --> crates/cxx-qt-lib/src/gui/qfont.rs:363:23
    |
363 |         #[rust_name = "qfont_to_debug_qstring"]
    |                       ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D dead-code` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(dead_code)]`

[jnbooth]

@ahayzen-kdab Fixed!

[LeonMatthesKDAB]

Thank you for the contribution @jnbooth 🚀