Update to Wasmer 3.x

[PieKing1215]

I updated this to wasmer 3.x while I was trying to debug a panic I was getting.

The only differences in the public API are:

• call_function and call_function_with_argument now both take &mut self (call_function_with_argument was &self before for some reason).
• import_function_with_context and import_function both require the function to be Sync now

Otherwise the changes are mainly just passing Store references around more and updating some changed names.

[alec-deason]

This sounds great. I haven't thought about this code in a bit so I'm going to need some time to refresh before I feel comfortable merging but I'll try to take a closer look this weekend. Thanks.