Code completion improvements

[Hamish Rodda]

Hi,

I've fiddled with the code completion stuff in Kate to try to make it easier 
to use.  The attached patch aligns the text and postfix parts of each code 
completion entry, and allows implementations to set headings - see attached 
screenshot.  It's obviously not perfect yet, I'm posting to see what people 
think...

* I guess it would be best to use the document's highlighting definitions to 
determine the colours & font attributes?

* Should kate handle the truncating of overly long prefixes?

* is the type field supposed to be used for things like these?

Thoughts / comments welcome.

Cheers,

Hamish.
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