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Adding two global inline function pointers to allocate/deallocate
memory. This patch allows the use of external tools instead of default
malloc/free functions.

The input widget does not affect the default_* variable used to
initialize or reinitialize models. This patch fix the variable.

(closes:#27).

Fix access to the MAXPATHLEN macro

Using std::filesystem::is_* function may throw exception [1].
Use the same functions with the std::error_code parameter to fix
the problem. (closes: #21).

https://developercommunity.visualstudio.com/t/stdfilesystemis-directory-fails-with-exception-if/787098