Re-implemented renegotiation extension to comply with RFC5746 and RFC5246

[daanpape]

Description

In this pull request I have re-implemented the renegotiation extension headers to comply with RFC5746 and RFC5246. This is required for PionDTLS to work with WolfSSL which strictly follows these RFCs and stops to connection when the renegotiation extension is wrongly added to the ServerHello response.

Reference issue

Fixes #687

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.53%. Comparing base (f0c0987) to head (e3cf6bc).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #711      +/-   ##
==========================================
- Coverage   78.55%   78.53%   -0.03%     
==========================================
  Files         101      101              
  Lines        6828     6834       +6     
==========================================
+ Hits         5364     5367       +3     
- Misses       1089     1092       +3     
  Partials      375      375              

Flag	Coverage Δ
go	78.55% <100.00%> (-0.03%)	⬇️
wasm	57.15% <100.00%> (+0.03%)	⬆️

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[nils-ohlmeier]

lgtm