Changes

@MarijnS95 #20 Added API to pass through an allowlist of functions to Bindgen. This is done by setting the bindgen_options option on the ispc_compile::Config. This sets the allowlist_function option in the Bindgen settings for generating the header: https://docs.rs/bindgen/latest/bindgen/struct.Builder.html#method.allowlist_function , enabling applications to filter out undesired items from the generated Rust module file. See the simple example for an example of using this feature.

Fixes

@MarijnS95 #17 replace the yanked aligned_alloc crate with std::alloc
@MarijnS95 #19 update image dependency to address CVE in dependency, #18 cleanups to formatting and build config
Update to Rust edition 2021