fixes #844 WebSocket wildcard host errors

[gdamore]

fixes #1224 wss fails on IPV6 address

This fixes bugs and inconsistencies in the way addresses are
handled for HTTP (and consequently websocket). The Host:
address line needs to look at numeric IPs and treat wildcards
as if they are not specified, and needs to understand the IPv6
address format using brackets (e.g. [::1]:80).

[gdamore]

Note also this uses IP address parsing to ensure that we cope with the various different yet equivalent ways of handling IP addresses. However v4mapped addresses might not behave properly.

[codecov]

Codecov Report

Merging #1266 into master will decrease coverage by 0.43%.
The diff coverage is 63.96%.

@@            Coverage Diff             @@
##           master    #1266      +/-   ##
==========================================
- Coverage   80.97%   80.54%   -0.44%     
==========================================
  Files         118      118              
  Lines       19420    19519      +99     
==========================================
- Hits        15726    15722       -4     
- Misses       3694     3797     +103     

Impacted Files	Coverage Δ
src/supplemental/http/http_server.c	68.95% <52.08%> (-0.79%)	⬇️
src/platform/posix/posix_resolv_gai.c	76.13% <71.66%> (-2.68%)	⬇️
src/core/platform.h	87.77% <100.00%> (+0.27%)	⬆️
src/supplemental/tcp/tcp.c	78.96% <100.00%> (ø)
src/supplemental/http/http_conn.c	79.89% <0.00%> (-3.27%)	⬇️
src/transport/ws/websocket.c	84.38% <0.00%> (-3.00%)	⬇️
src/core/aio.c	94.55% <0.00%> (-1.93%)	⬇️
src/transport/tcp/tcp.c	76.60% <0.00%> (-1.65%)	⬇️
src/supplemental/websocket/websocket.c	65.82% <0.00%> (-1.09%)	⬇️
... and 9 more

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[gdamore]

The code complexity stuff is annoying. There really isn't a great way to make that better.