[patch] remove IProjectController::findProjectByName

[Manuel Breugelmans]

This findProjectByName method is flawed because it is perfectly legal to have 
multiple projects with the same name. Right now it retrieves the first project 
with this name in it's internal data structure, ie undefined behavior.

The method is only used in the buildsetmodel. I didn't actually check but I'm 
pretty sure the buildset will act weird with multiple identically named 
projects.

Attached patch removes this method from the API. It also fixes the buildset by 
storing the project root URL for every item.


Manuel
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