26.20 support

[marioCST]

• Removed a few unused or unnecessary signatures.
• Added entt for more convenience when working with components (!! As the compiler was changed with 26.20, you HAVE to define the component hashes manually !! Though, due to how the structs are defined, you have to define them no matter what).
• Refactored parts of the SDK to remove more signatures (and to make updating easier for me lol).

You can still use regular MSVC to build the project. Haven't tested building with Clang. There might be undefined behavior or other unknown side effects.