[PING/RFA]: Search for Objc Symbols

[Adam Fedor]

I've broken out the changes into their own functions. Looking at the 
comments in make_file_symbol_completion_list now, it seems like the 
language_search_unquoted_string function or something similar should go 
in the language vector. But I'm not sure that's necessary, so I didn't 
want to do it unless some one made me :-)

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