Linux port - Githubissues

This PR introduces very basic Linux support. Fixes #26.

These changes have been made to the source code to make this happen:

Conditionally including header files based on the platform
Move the logic to locate Immolate executable path in its own function, which is platform dependent
Define the MAX_PATH constant which is not defined in a Linux environment
Define the _s variants of functions to non _s variants ones since GCC / Clang do not ship those by default
Added support to extensions to the C compiler, which would otherwise complain about the readlink function

Additionally, some minor bugs have been fixed:

Added formats to some printf_s which would use string buffers as formats instead of using "%s
Made the main function always return an integer
Added some \n here and there
Using EXIT_SUCCESS and EXIT_FAILURE instead of 0 and 1

Finally, some bare-bone documentation has been added for the Debian distribution, which should be similar to other distributions too.

It would be cool to include CI/CD building and/or Docker, but unfortunately I do not have time for that.

Thanks for the great project! I see that you are porting it to C++, I do understand if this MR does not get merged in!

MathIsFun0 / Immolate