Update to draft 29

[Ralith]

Fairly minor changes this time around. The refactored PTO logic is the only significant regression hazard.

Fixes #801.

[codecov]

Codecov Report

Merging #812 into master will increase coverage by 0.07%.
The diff coverage is 92.70%.

@@            Coverage Diff             @@
##           master     #812      +/-   ##
==========================================
+ Coverage   71.85%   71.92%   +0.07%     
==========================================
  Files          74       74              
  Lines       13585    13616      +31     
==========================================
+ Hits         9761     9793      +32     
+ Misses       3824     3823       -1     

Impacted Files	Coverage Δ
interop/src/main.rs	0.00% <0.00%> (ø)
interop/src/server.rs	0.00% <0.00%> (ø)
quinn-h3/src/lib.rs	39.78% <ø> (ø)
quinn-proto/src/crypto/rustls.rs	86.58% <ø> (ø)
quinn-proto/src/lib.rs	83.33% <ø> (ø)
quinn-proto/src/transport_error.rs	64.51% <ø> (ø)
quinn-proto/src/connection/mod.rs	79.84% <96.47%> (+0.37%)	⬆️
quinn-proto/src/connection/spaces.rs	91.36% <100.00%> (+0.19%)	⬆️
quinn-proto/src/endpoint.rs	77.86% <100.00%> (ø)
quinn-proto/src/packet.rs	87.10% <100.00%> (ø)
... and 3 more

---

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[djc]

Thanks for doing the work on this!