This is some pretty decent stuff. One big criticism is that this code reeks of C code with Classes and not real C++ code. Writing procedural code with classes does not make Object Oriented code. I'm also not a big fan of monolithic header files like that. Small, readable chunks of code are leagues better than having massive do-everything classes.

Thank you.

Yes, I'm aware I write "C-oriented code" and I've never had any formal education. I intertwine the two, and technically, it's all C++ code.
The entire paradigm behind object oriented programming is stupid in my eyes, but there are benefits from using object oriented tools in a procedural manner, as you can clearly see.
Yes, I'm aware that the header files are rather large: This is an old project and I change it quite a lot, the files are no longer like that, thank you for the criticism.

Sorry I missed it.