Add ctags support

[gennad]

Does it support ctags? From the source code I can see that doesn't. I'm proposing to add it.

[gennad]

As a follow-up question, do we have some widget to display a list of suggestions?

I'm thinking that if the cursor in on the function that has multiple definitions in the source base, there must be a pop-up box to display the list of suggestions to let user choose one of them manually like it works in Vim

[dschuyler]

I've been considering alternative UIs. I realize it's common to display a suggestion pop-up, but I'd like to explore whether there's a better way.

What about displaying suggestions in a separate area of the screen, like a dedicated area that doesn't pop-up.

Or, I was also considering opening space in the window to display suggestions that are not a pop-up. It would be a bit more like doing a code review where the code would separate between one line and the next to show the annotation.

I'm open to input on this. What do you think?