make "No matching function call" candidates clickable

[Manuel Massing]

Hi,

I've attached a small patch for the build output toolview.

When gcc encounters a non-matching function call, it spits out a 
list of candidate items. This patch makes the candidate items clickable,
so one can jump to the declaration.

The patch also introduces a differentiation between informative/warning
messages, which is not really necessary for this patch, but might prove useful
in the future. This part assumes that MakeOutputModel.h does not need to
retain interface compatibility.

cheers,

  Manuel
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