Feature/struct completion

[sanoprime]

• code completion for structs, union, enum, const, import, functions, macros
• go to declaration from import to module(s)
• add import QuickFix

[lerno]

I can't get it to work with structs, and another thing, if I am code completing bar::test() now it will replace it with ar::test(). So something happened...

[sanoprime]

I fixed ar::test() problem.

Can you provide me exmaple code with structs that don't work?