A lot of the code ended up being duplicated between the four api calls,
on top of that some type handling checks had to be made in both create_hook and get_orig_function.
This lead to a very messy state of things, so combine all of the handling into a single function,
then we can proceed with the rest of the code expecting one thing.
Having a single entry point made it very easy to add support for delaying hook cleanly.
Also add support for "Obj.Method" notation for backward-compatibility with old hooks.
I initially tried to use string.split provided by fatshark's code, but it creates a table, and requires a lot of supporting code that is all avoided by using a simple string.sub call.
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