WebSocket support

[meejah]

This builds on the new iosim.IOPump-based tests to add WebSocket support with proper tests.

Needs:

• branch-coverage of tests in a few more places
• there are two new_protocol_ws implementations; unify
• possibly more cleanup
• [ ]

[lgtm-com]

This pull request introduces 13 alerts when merging 141709b into de8e0f0 - view on LGTM.com

new alerts:

• 5 for First parameter of a method is not named 'self'
• 5 for Unused import
• 1 for Use of the return value of a procedure
• 1 for Non-callable called
• 1 for Unreachable code

[lgtm-com]

This pull request introduces 13 alerts when merging 553158d into de8e0f0 - view on LGTM.com

new alerts:

• 5 for First parameter of a method is not named 'self'
• 5 for Unused import
• 1 for Use of the return value of a procedure
• 1 for Non-callable called
• 1 for Unreachable code

[codecov]

Codecov Report

Merging #23 (6bd063a) into master (0de4f23) will increase coverage by 0.13%.
The diff coverage is 99.44%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage   99.07%   99.21%   +0.13%     
==========================================
  Files           5        7       +2     
  Lines         326      512     +186     
  Branches       48       55       +7     
==========================================
+ Hits          323      508     +185     
  Misses          1        1              
- Partials        2        3       +1     

Impacted Files	Coverage Δ
src/wormhole_transit_relay/usage.py	98.68% <98.68%> (ø)
src/wormhole_transit_relay/server_state.py	99.43% <99.43%> (ø)
src/wormhole_transit_relay/server_tap.py	100.00% <100.00%> (ø)
src/wormhole_transit_relay/transit_server.py	100.00% <100.00%> (+0.51%)	⬆️

---

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[lgtm-com]

This pull request introduces 9 alerts when merging aa58b85 into 0de4f23 - view on LGTM.com

new alerts:

• 5 for First parameter of a method is not named 'self'
• 2 for Use of the return value of a procedure
• 1 for Non-callable called
• 1 for Unreachable code

[lgtm-com]

This pull request introduces 9 alerts when merging 807dfc1 into 0de4f23 - view on LGTM.com

new alerts:

• 5 for First parameter of a method is not named 'self'
• 2 for Use of the return value of a procedure
• 1 for Non-callable called
• 1 for Unreachable code

[vu3rdd]

Left one or two silly comments, overall looks really great. Automat based state machine looks very nice!

[vu3rdd]

I don't know anything about iosim, so I only skimmed this part of the code and did not go deeply into iosim itself.

[vu3rdd]

This whole state machine logic is very beautiful and so clear to read!

[vu3rdd]

Looks great!

[lgtm-com]

This pull request introduces 9 alerts when merging 6bd063a into 0de4f23 - view on LGTM.com

new alerts:

• 5 for First parameter of a method is not named 'self'
• 2 for Use of the return value of a procedure
• 1 for Non-callable called
• 1 for Unreachable code