Crate bevy_dylib

Forces dynamic linking of Bevy.

Dynamically linking Bevy makes the “link” step much faster. This can be achieved by adding bevy_dylib as dependency and #[allow(unused_imports)] use bevy_dylib to main.rs. It is recommended to disable the bevy_dylib dependency in release mode by adding #[cfg(debug_assertions)] to the use statement. Otherwise you will have to ship libstd.so and libbevy_dylib.so with your game.