add memory function accessors

[tertyshnyi]

I added new 3 functions stumpless_get_malloc(), stumpless_get_free(), stumpless_get_realloc(). And added pointer and null tests to them. Is this enough?

[tertyshnyi]

memory function accessors + tests

[tertyshnyi]

I removed the function I mistakenly added earlier, it should work now.

[goatshriek]

This is off to a great start, and I especially appreciate that you updated the test macros to use the new functions. A few things to help you get this over the finish line: don't forget to add the functions to src/windows/stumpless.def, and move the declarations in include/stumpless/memory.h within the extern "C" block so that the C++ name mangling isn't mistakenly applied to them.

[tertyshnyi]

Thanks for the tip. I wrote functions in stumpless.def and wrote functions in extern “C” memory.h . I also changed the tests, removed the check for null because get functions do not return null, added 3 new ones that custom functions correctly replace standard functions and can be retrieved.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.60%. Comparing base (1d2df58) to head (4845825).
Report is 1 commits behind head on latest.

Additional details and impacted files

@@            Coverage Diff             @@
##           latest     #468      +/-   ##
==========================================
+ Coverage   90.59%   90.60%   +0.01%     
==========================================
  Files          47       47              
  Lines        4379     4385       +6     
  Branches      587      587              
==========================================
+ Hits         3967     3973       +6     
  Misses        279      279              
  Partials      133      133              

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