Add casr-csharp

[headshog]

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[codecov]

Codecov Report

Attention: Patch coverage is 90.98361% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 63.82%. Comparing base (4a8ad43) to head (402e540).

Files	Patch %	Lines
casr/src/bin/casr-csharp.rs	92.85%	5 Missing ⚠️
casr/src/bin/casr-afl.rs	88.46%	3 Missing ⚠️
casr/src/bin/casr-libfuzzer.rs	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #207      +/-   ##
==========================================
+ Coverage   62.70%   63.82%   +1.11%     
==========================================
  Files          33       34       +1     
  Lines        5414     5410       -4     
==========================================
+ Hits         3395     3453      +58     
+ Misses       2019     1957      -62     

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[SweetVishnya]

Also, fix clippy, please