Don't change timeout on pause/unpause

[ljwoods2]

Fixes #96

Changes made in this Pull Request:

• Don't change timeout when pausing/unpausing

Bug was occurring because of the following rare event:

• Client pauses simulation, sets timeout to 0 to make socket reads blocking
• Simulation writes an IMDFrame to its socket write buffer, and only i.e. the time packet is delivered "immediately"
• Simulation (correctly) stops sending new frames, but current frame is still in transit
• Client attempts to read an entire frame from the socket, finding only a time packet instead (since the rest is still in-transit)
• Since socket read is currently blocking, client fails out erroneously

This was based on the erroneous assumption that only full frames would be in memory when the simulation was paused, however, this is not true; packets could still be in transit which the simulation engine called write() on before the pause was acknowledged.

Thanks to @amruthesht for figuring this out

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.29%. Comparing base (07069e1) to head (5d7c1e1).
⚠️ Report is 3 commits behind head on main.

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[orbeckst]

Lgtm