Common casr tool

[hkctkuy]

Nobody wanted it, nobody asked it, but we did it anyway.

[codecov]

Codecov Report

Attention: Patch coverage is 77.47508% with 339 lines in your changes missing coverage. Please review.

Project coverage is 64.85%. Comparing base (2a5d294) to head (740675b).

Files with missing lines	Patch %	Lines
casr/src/mode/mod.rs	76.92%	39 Missing ⚠️
casr/src/mode/go.rs	0.00%	32 Missing ⚠️
casr/src/mode/rust.rs	0.00%	32 Missing ⚠️
casr/src/mode/java.rs	61.84%	29 Missing ⚠️
libcasr/src/gdb/exploitable.rs	39.53%	26 Missing ⚠️
libcasr/src/go.rs	13.33%	26 Missing ⚠️
libcasr/src/rust.rs	13.33%	26 Missing ⚠️
casr/src/mode/msan.rs	28.12%	23 Missing ⚠️
casr/src/run/gdb.rs	80.30%	13 Missing ⚠️
casr/src/mode/lua.rs	67.56%	12 Missing ⚠️
... and 17 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #259      +/-   ##
==========================================
- Coverage   66.21%   64.85%   -1.37%     
==========================================
  Files          34       52      +18     
  Lines        7640     7859     +219     
==========================================
+ Hits         5059     5097      +38     
- Misses       2581     2762     +181     

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[SweetVishnya]

These docs should be updated, I suppose

[SweetVishnya]

Please, add docs to all fields

[hkctkuy]

Do we need to add docs for private fields?