Preliminary breadcrumbs implementation - patch

[Ruchkin I]

Preliminary breadcrumbs implementation

This patch is work-in-progress towards 'breadcrumbs' nagivation in KDevelop,
that hopefully will be able to replace tabs one day. The patch is
preliminary, and is not meant to be committed right now, but I wanted to
check if the general direction is right.

-On each tab a special 'breadcrumbs' navigation bar, showing the path from
root to current document, is added.
-The list of files is split into 2 categories: files that have already been
opened somewhen and other files. This feature is now in development and
maybe will be changed, so in this version files are split into categories
using the filename lenght, just for testing purposes.


Intended changes:
-Implement real code for detecting what files are open - the current code is
dummy.
-Improve the popup dialog with files.
-Include project name and current function in the navigator.
-Change in general appearance.

-- 
Best regards,
Ruchkin I
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