ObjectPool creates uninitialized memory of forbidden types

[riking]

See also #87. This was introduced in commit 9c28844, part of version 0.6.0.

https://asan.saethlin.dev/ub?crate=crayon&version=0.7.1

---- src/video/mod.rs - video (line 113) stdout ----
Test executable failed (signal: 6 (SIGABRT) (core dumped)).

stderr:
thread 'main' panicked at /root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:136:5:
attempted to leave type `crayon::video::assets::shader::ShaderParams` uninitialized, which is invalid
stack backtrace:
   0: rust_begin_unwind
             at /root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:597:5
   1: core::panicking::panic_nounwind_fmt
             at /root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:106:14
   2: core::panicking::panic_nounwind
             at /root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:136:5
   3: core::mem::uninitialized
             at /root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/mem/mod.rs:692:9
   4: crayon::utils::object_pool::ObjectPool<H,T>::free
             at ./src/utils/object_pool.rs:80:29
   5: crayon::video::system::VideoSystem::delete_shader
             at ./src/video/system.rs:203:12
   6: crayon::video::delete_shader
             at ./src/video/mod.rs:302:5
   7: rust_out::main::_doctest_main_src_video_mod_rs_113_0
             at ./src/video/mod.rs:33:1

[affected]
functions = { "crayon::utils::object_pool::ObjectPool<H,T>::free" = [">=0.6.0"] }