This adds a few new crates that have more complete bindings than their predecessors (our ffi module is now a lot smaller), and uses the new available! macro to check for availability of APIs before using them.

• Tested on all platforms changed
• Added an entry to the changelog module if knowledge of this change could be valuable to users
• Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• Created or updated an example program if it would help users understand this functionality