Release 2.29.6

- Documentation: describe lsquic internals ("guts").
- Two more fixes to compliance issues found by h3spec.
- Truncate, don't abort, SCIDs larger than 16 bytes (PR #244).
- Several small internal improvements and space optimizations.

tools/gen-tags.pl

@@ -54,6 +54,7 @@ while (<TMPFILE>)
      or s/^iquic_esf_/esf_/
      or s/^gquic[0-9]?_esf_/esf_/
      or s/^iquic_esfi_/esfi_/
+     or s/^lsquic_[sh]pi_/pii_/
      or s/^(lsquic_cubic|lsquic_bbr)_/cci_/
     )
     {