Fix reply ordering per endpoint

[dorssel]

Fixes #219

[codecov]

Codecov Report

Merging #224 (ac039de) into master (df8c099) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #224      +/-   ##
==========================================
- Coverage   34.13%   34.06%   -0.08%     
==========================================
  Files          23       23              
  Lines        1910     1914       +4     
==========================================
  Hits          652      652              
- Misses       1258     1262       +4     

Impacted Files	Coverage Δ
UsbIpServer/AttachedClient.cs	0.00% <0.00%> (ø)

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[eteq]

I tested this and it does indeed resolve #219 !

(I also gave the PR a line-by-line read, and while my C# is not that strong, I didn't have any changes to suggest!)