Auto merge of #443 - scoopr:objc, r=emilio

Add initial Objective C support

Hi! I made an attempt to support parsing objective c headers. This is very much incomplete,
and likely not quite yet ready for merging, but I thought I'd share the progress so far.

Comments appreciated, I'm still very much a newbie in just about everything related to this change (rust as a language, rust ast, libclang, rust-bindgen), and there were many parts of code I wasn't quite sure about.

Commit message:
It parses interfaces and protocol but ignores base classes,
methods that don’t have arguments, the arguments are currently ignored.
Also you can pass objc class instances to C functions.

Next steps are inheritance/base classes, method signatures,
properties, categories.
Then check with system headers what is missing.

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