API functions for accessing version in runtime

[agruzdev]

Added API functions for getting version string, version number, compiler name, and compilation date in runtime. It's useful when shared library is loaded in runtime.

[fador]

Thanks, it would indeed be useful to get the info.
But you also need to add the definitions to the Autotools configure.ac since that's what we still officially support 😁

[agruzdev]

Okay, I will do.
Just a bit confused. Why there is also API version 7.4.0 at the same time with project version 2.3.2 (used for releases)? The API version is used only for .SO files?

[fador]

I would call it the legacy library versioning, with each change to the API we would increment the version. Major version increase would be a breaking API change and I don't think we had any of those.
Not sure does it matter anymore..

[agruzdev]

Done. I'm not experienced with autotools, but seems to work. All tests in AppVeyor are passed too.

[fador]

Nice, thank you!
We are planning on deprecating the autotools at some point so I'm not so worried about that anyway ;)