include cassert instead of assert.h

cassert is the preferred way in C++. It doesn't contain static_assert
which is otherwise a keyword.

https://stackoverflow.com/a/43011752/1266123
https://en.cppreference.com/w/cpp/header/cassert
https://en.cppreference.com/w/cpp/language/static_assert

(cherry picked from commit 4c99f1a4) (edited)
edited:
- 3.0 has less files in C++ (d3d11, medialibrary, renderer)
- some Qt files were moved in 4.0