Remove GitModule.StreamCopy

[drewnoakes]

This method exists in the framework as Stream.CopyTo.

https://docs.microsoft.com/en-us/dotnet/api/system.io.stream.copyto?view=netframework-4.7.1

[codecov]

Codecov Report

Merging #4656 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #4656      +/-   ##
==========================================
+ Coverage   26.68%   26.68%   +<.01%     
==========================================
  Files         501      501              
  Lines       40752    40747       -5     
  Branches     5961     5960       -1     
==========================================
  Hits        10873    10873              
+ Misses      29379    29374       -5     
  Partials      500      500

Impacted Files	Coverage Δ
GitCommands/Git/GitModule.cs	8.57% <0%> (+0.02%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9949704...be0e349. Read the comment docs.

[gerhardol]

I believe there were a similar change some months ago...

[drewnoakes]

I believe there were a similar change some months ago...

Yep. Looks like it was #4343.