Fix improper uses of reinterpret_cast

[GravisZro]

There are many instances where a class is inappropriately reinterpret_cast'd to a subclass. A static_cast should be used to verify they are in fact convertible types.

There are also instances where a void* is inappropriately reinterpret_cast'd. static_cast should be used with void* because void* is universally convertible.

Further reading: https://en.cppreference.com/w/cpp/language/static_cast