Translate the code from C# to C++

[konard]

500 RUB reward can be claimed by anyone who completes this task.

[konard]

Should be translated:

• Bit.h
• Math.h

Not to be translated:

• Arithmetic.h
• ArithmeticExtensions.h
• Arithmetic[T].h
• BitExtensions.h
• Bit[T].h
• MathExtensions.h
• Math[T].h

In tests, only BitTests.cpp file have meaning. No need to translate benchmarks.

[uselessgoddess]

@konard please review this request #91